Taking into account the definition of dilution, the concentration of the new solution is 1 mol/L.
DilutionWhen it is desired to prepare a less concentrated solution from a more concentrated one, it is called dilution.
Dilution is the process of reducing the concentration of solute in solution, which is accomplished by simply adding more solvent to the solution at the same amount of solute.
In a dilution the amount of solute does not change, but as more solvent is added, the concentration of the solute decreases, as the volume (and weight) of the solution increases.
A dilution is mathematically expressed as:
Ci×Vi = Cf×Vf
where
Ci: initial concentrationVi: initial volumeCf: final concentrationVf: final volumeFinal volumeIn this case, you know:
Ci= 6 mol/LVi= 200 mLCf= ?Vf= 1 L (1000 mL) water + 200 mL of HCL= 1200 mLReplacing in the definition of dilution:
6 mol/L× 200 mL= Cf× 1200 mL
Solving:
(6 mol/L× 200 mL)÷ 1200 mL= Cf
1 mol/L= Cf
In summary, the concentration of the new solution is 1 mol/L.
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PLEASE HELP!!!
If a 435 mL sample of gas at 219 °C is allowed to expand (at constant pressure) to a volume of 842 mL, what will be the new temperature (in °C)?
Answer:
424 °C
Explanation:
If all other variables are held constant, the missing temperature can be found using the Charles' Law equation:
V₁ / T₁ = V₂ / T₂
In this equation, "V₁" and "T₁" represent the initial volume and temperature. "V₂" and "T₂" represent the final volume and temperature. You can plug the given values into the equation and simplify to find the final temperature.
V₁ = 435 mL V₂ = 842 mL
T₁ = 219 °C T₂ = ? °C
V₁ / T₁ = V₂ / T₂ <----- Charles' Law
435 mL / 219 °C = 842 mL / T₂ <----- Insert values
1.9863 = 842 mL / T₂ <----- Simplify left side
(1.9863) x T₂ = 842 mL <----- Multiply both sides by T₂
T₂ = 424 °C <----- Divide both sides by 1.9863
Part A
How much heat is required to convert 4.88 g of ice at-14.0°C to water at 23.0°C? (The heat capacity of ice is 2.09 J/(g- "C). AHp (H₂O) = 40.7 kJ/mol, and AH (H₂O) = 6.02 kJ/mol.)
Express your answer with the appropriate units.
?
Taking into account the definition of calorimetry, sensible heat and latent heat, the amount of heat required is 2.243974 kJ or 2,243.974 J.
Definition of calorimetry, sensible heat and latent heatCalorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.
Sensible heat is defined as the amount of heat that a body absorbs or releases without any changes in its physical state (phase change).
Latent heat is defined as the energy required by a quantity of substance to change state.
When this change consists of changing from a solid to a liquid phase, it is called heat of fusion and when the change occurs from a liquid to a gaseous state, it is called heat of vaporization.
-14 °C to 0°CIn firts place, you know that the melting point is 0°C. So, first of all you must increase the temperature from -14 ° C (in solid state) to 0 ° C, in order to supply heat without changing state (sensible heat).
The amount of heat a body receives or transmits is determined by:
Q = c× m× ΔT
where Q is the heat exchanged by a body of mass m, made up of a specific heat substance c and where ΔT is the temperature variation.
In this case, you know:
c(solid)= heat capacity of ice= 2.09 [tex]\frac{J}{gC}[/tex]m= 4.88 gΔT= Tfinal - Tinitial= 0 °C - (-14) °C= 14 °CReplacing:
Q1= 2.09 [tex]\frac{J}{gC}[/tex] × 4.88 g× 14 °C
Solving:
Q1=142.7888 J= 0.1427888 kJ
Change of stateThe heat Q that is necessary to provide for a mass m of a certain substance to change phase is equal to
Q = m×L
where L is called the latent heat of the substance and depends on the type of phase change.
In this case, you know:
n= 4.88 g×[tex]\frac{1 mole}{18 g}[/tex] = 0.2711 moles, where 18 [tex]\frac{g}{mole}[/tex] is the molar mass of H₂O, that is, the amount of mass that a substance contains in one mole.ΔHfus= 6.02 [tex]\frac{kJ}{mol}[/tex]Replacing:
Q2= 0.2711 moles×6.02 [tex]\frac{kJ}{mol}[/tex]
Solving:
Q2= 1.632022 kJ
0 °C to 23 °CSimilar to sensible heat previously calculated, you know:
c(liquid)= specific heat of water= 4.18[tex]\frac{J}{gC}[/tex]m= 4.88 gΔT= Tfinal - Tinitial= 23 °C - 0 °C= 23 °CReplacing:
Q3= 4.18[tex]\frac{J}{gC}[/tex] × 4.88 g× 23 °C
Solving:
Q3= 469.1632 J= 0.4691632 kJ
Total heat requiredThe total heat required is calculated as:
Total heat required= 0.1427888 kJ + 1.632022 kJ + 0.4691632 kJ
Total heat required= 2.243974 kJ= 2,243.974 J
In summary, the amount of heat required is 2.243974 kJ or 2,243.974 J.
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What happens when food first touches your tongue?
Answer:
you will taste the flavour of the food
Which of the following sublevels contains only orbitals that are shaped like bells?
6f
4d
3p
5s
The sublevels that contains only orbitals that are shaped like bells are the 3p. That is option C.
What are atomic orbitals?Atomic orbitals are defined as the mathematical terms that are used to describe the positions of electrons on the atoms.
Examples of sublevels of atomic orbitals are s, p, d, and f. The 3p are the only orbitals that are bell like in shape
Therefore, sublevels that contains only orbitals that are shaped like bells are the 3p.
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PLEASE ANSWER!!!
Radium-223 nuclei usually decay by alpha emission. Once in every billion decays, a radium-223 nucleus emits a carbon-14 nucleus.
Write a balanced nuclear equation for alpha emission.
The balanced neclear equation for alpha emission will be:
[tex]88Ra^2^2^3 --- > 86Rn^2^1^9 + 2He^4[/tex]
What is Radioactive decay?Radioactive decay occurs when unstable isotopes have their nuclei ruptured due to atomic instability. To understand why an isotope disintegrates, we need to look at the atomic nucleus. It is known that the nucleus is loaded with positive particles (protons), and that these are very close to each other. It is also true that particles with equal charges repel each other. Therefore, the proximity of the protons causes them to start to repel each other, in an attempt to take up as much space as possible. In view of this, the nucleus breaks, as it cannot bear these repellent charges.
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Question 6
To what temperature must 15 L of oxygen gas at -30°C be heated at 1 atm pressure in order to occupy a
volume of 23 L, assuming that the pressure increases by 58 mm Hg?
unit:
Submit Question
Question 7
0/1 pt10 Deta
Jump to Answer
1/1 pt Details
Considering the combined law equation, the new temperature is -244.56 °C or 28.44 K.
Boyle's lawBoyle's law states that the pressure of a gas in a closed container is inversely proportional to the volume of the container, when the temperature is constant: if the pressure increases, the volume decreases while if the pressure decreases, the volume increases.
Mathematically, this law states that the multiplication of pressure by volume is constant:
P×V=k
Charles's lawCharles's law states that the volume is directly proportional to the temperature of the gas: if the temperature increases, the volume of the gas increases while if the temperature of the gas decreases, the volume decreases.
Mathematically, Charles' law states that the ratio of volume to temperature is constant:
[tex]\frac{V}{T} =k[/tex]
Gay-Lussac's lawGay-Lussac's law states that the pressure of a gas is directly proportional to its temperature: increasing the temperature will increase the pressure, while decreasing the temperature will decrease the pressure.
Mathematically, Gay-Lussac's law states that the ratio of pressure to temperature is constant:
[tex]\frac{P}{T} =k[/tex]
Combined law equationCombined law equation is the combination of three gas laws called Boyle's, Charlie's and Gay-Lusac's law:
[tex]\frac{PxV}{T} =k[/tex]
Considering an initial state 1 and a final state 2, it is fulfilled:
[tex]\frac{P1xV1}{T1} =\frac{P2xV2}{T2}[/tex]
New temperatureIn this case, you know:
P1= 1 atm= 760 mmHgV1= 15 LT1= -30 °C= 243 K (being 0 °C= 273 K)P2= 58 mmHgV2= 23 LT2= ?Replacing in the combined law equation:
[tex]\frac{760 mmHgx15 L}{243 K} =\frac{58 mmHgx23 L}{T2}[/tex]
Solving:
[tex]T2x\frac{760 mmHgx15 L}{243 K} =58 mmHgx23 L[/tex]
[tex]T2 =\frac{58 mmHgx23 L}{\frac{760 mmHgx15 L}{243 K}}[/tex]
T2= 28.44 K= -244.56 °C
Finally, the new temperature is -244.56 °C or 28.44 K.
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Boyels law lab report
Boyle's law is a model used in chemistry and physics to estimate the pressure behavior of gases in a closed system.
What is Boyle's law?Boyle's law is a model used to calculate pressure and volume relationships among gases in a thermodynamically closed system.
This law states that the pressure of a given gas represents an inversely proportional measurement of its volume in steady conditions.
In conclusion, Boyle's law is a model used in chemistry and physics to estimate the pressure behavior of gases in a closed system.
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58. Which of the following aqueous solutions has the lowest freezing point? A. 0.2 M NaCl B. 0.2 M FeCl3 C. 0.2M sucros D. 0.2 M CaCl2
The correct option is D. 0.2 M CaCl2 is has the lowest freezing point.
What is aqueous solution?When one significance liquefies into another, a solution is formed. A solution is a homogenous mixture consisting of a solute dissolved into a solvent. The solute is the essence that is being dissolved, while the solvent is the dissolving medium. Solutions can be formed with multiple different classifications and forms of solutes and solvents. In this branch, we will focus on a resolution where the solvent is water.
An aqueous solution is a moisture that contains one or more dissolved essence. The dissolved importance in an aqueous solution may be solids, gases, or different liquids.In directive to be a true solution, an assortment must be stable. When sugar is fully dissolved into moisture, it can stand for an undetermined amount of time, and the sugar will not recompense out of the solution. Further, if the sugar-water solution is passed through a filter, it will stay with the water. This is because the liquefied particles in a resolution are very small, usually less than 1nm in diameter. Solute particles can be atoms, ions, or molecules, counting on the type of essence that has been dissolved.To learn more about aqueous solution, refer to:
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Analyze the following reaction and the given scenarios to discuss the relationship between volume and reaction rate. Determine which reaction will happen at a faster rate and explain why.
NH3(g) + 2O2(g) → HNO3(l) + H2O(l)
The first reaction is started in a gas chamber with a volume of 10 L. The second reaction is started in a gas chamber with a volume of 5 L.
The second reaction with the volume of 5L will occur faster as compared to the first reaction of volume 10L.
Volume is inversely proportional to the rate of reaction.
As volume increases rate of reaction decreases and as volume decreases rate of reaction increases.
Let's consider a reaction A → B.
r is rate of reaction and K is rate constant, A is the concentration of reaction.
r = k(A)
r is directly proportional to the A.
But the concentration of A is in Moles/liters (i.e. moles per unit volume)
r is inversely proportional to the volume of vessel or chamber.
Hence as volume increases rate of reaction decreases.
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What two properties affect the
density of ocean water?
Answer: temperature and salinity.
Explanation:
GIVING BRAINLIEST!!!!!!!!! (and the rest of my points)
The Himalayan balsam plant makes seeds in pods and releases them when it is ready, while the Surinam toad absorbs its eggs into its own back until they are ready to come out. How are the adaptations of the balsam and the toad similar?
A. They are behaviors that allow the plant and the animal to reproduce through shorter life cycles.
B. They are behaviors that protect the plant and the animal from predators.
C. They are life cycle differences that protect the offspring and help them to survive.
D. They are physical characteristics that allow the offspring to survive in cold weather conditions.
They are life cycle differences that protect the offspring and help them to survive. The correct option is C.
Life cycle adaptionSome organisms have life cycle features that ensure that their population is perpetuated in subsequent generations.
Such features include ensuring that propagules are only released when they are mature and making sure that eggs are hatched and offspring become viable before they are allowed to move to the environment.
These actions will make sure that the propagules of offspring have what it takes to survive in their new environment.
In other words, these life cycle features are embedded in the genome of organisms as a way to survive the environment.
Thus, the features of the Himalayan balsam plant and that of the Surinam toad are more or less targeted toward the same thing - the survival of their offspring.
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Answer: Option (C) is correct, They are life cycle differences that protect the offspring and help them to survive.
Explanation: Hope it helps!
Good luck!!!
What mass of water could be warmed from 21.4 degrees celsius to 43.4 degrees celsius by the pellet dropped inside it? Heat capacity of the pellet is 56 J/degrees celsius. the pellet is initially at 113 degrees celsius.
42.34 g of water could be warmed from 21.4°C to 43.4°C by the pellet dropped inside it
Heat loss by the pellet is equal to the Heat gained by the water.
[tex]q_{w} = -q_{p}[/tex] ….(1)
where, [tex]q_{w}[/tex] is the heat gained by water
[tex]q_{p}[/tex] is the heat loss by pellet
[tex]q_{w}[/tex] = mCΔT
where m = mass of water
C = specific heat capacity of water = 4.184 J/g-°C
ΔT = Increase in temperature
ΔT for water = 43.4 - 21.4 = 22°C
[tex]q_{w}[/tex] = m × 4.184 × 22 …. (2)
Now
[tex]q_{p}[/tex] = [tex]H_{c}[/tex] ×ΔT
where [tex]H_{c}[/tex] = Heat capacity of pellet = 56J/°C
Δ T for pellet = 43.4 - 113 =- 69.6°C
[tex]q_{p}[/tex] = 56 × -69.6 = -3897.6 J
From equation (1) and (2)
-m× 4.184 × 22 =-3897.6
m= 42.34 g
Hence, 42.34 g of water could be warmed from 21.4 degrees Celsius to 43.4 degrees Celsius by the pellet dropped inside it.
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what are the factors affecting qualitative analysis in chemistry
Answer:
Techniques and Tests
Qualitative analysis typically measures changes in color, melting point, odor, reactivity, radioactivity, boiling point, bubble production, and precipitation.
The volume of a sample of oxygen is 580.3 mL when
the pressure is 0.376 atm and the temperature is 43 °C.
At what temperature is the volume 907.1 L and the
pressure 0.415 atm?
a. 545
O b. 74.2
O c. -89.9
O d. 272
Answer:
545
Explanation:
If we let the unknown temperature in Kelvin be x,
[tex] \frac{0.376 \times 580.3}{43+273} = \frac{0.415 \times 907.1}{x} \\ \\ x = 545[/tex]
State which substance is undergoing oxidation and which substance is undergoing reduction in the following reaction:
N2 (g) + 3 H2 (g) ---> 2 NH3 (g)
Answer:
H₂(g) = oxidized
N₂(g) = reduced
Explanation:
Oxidized substances lose electrons and increase in oxidation number. Reduced substances gain electrons and decrease in oxidation number.
Lone elements always have an oxidation number of 0. So, N₂(g) and H₂(g) have oxidation numbers of 0.
Within compounds, hydrogen generally always have an oxidation of +1. Therefore, the hydrogen in NH₃(g) has an oxidation number of +1. In order to make the overall compound neutral, the nitrogen in NH₃(g) must have an oxidation number of -3 (to balance the +3 from the 3 hydrogens).
Since H₂(s) is losing electrons (goes from 0 to +1), it is being oxidized. Since N₂(g) is gaining electrons (goes from 0 to -3), it is being reduced.
To answer this question, you may need access to the periodic table of elements.
Which of these would likely be the best conductor of electricity?
a.) H₂
b.) NO₂
c.) CaCl₂
d.) H₂O
Answer:
A
Explanation:
Beacuse the hydrogen is best
The best conductor of electricity here is calcium chloride because, metals are good conductors by the presence of free electrons. The CaCl₂ solution ionizes to Ca²⁺ ions and Cl- ions make it a good electrolyte.
What is conductivity?Conductivity is a physical property which describes the ability of a substance to pass electricity through it. The substance which shows good conductivity at normal temperatures are called conductors and those only conducts at higher temperatures are semiconductors.
Substance which does not conduct in any condition are called insulators. Metals are electron rich and the metal crystal lattice is composed of a sea of mobile electrons and a pool of positive ions. The delocalization of electrons make it easy to pass current through it.
When a metallic solution is ionized, it gives free ions and electrons and make the solution conducting. CaCl₂ is a good conductor since it contains the metal ions Ca²⁺ . Hence, option c is correct.
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A neutral atom has high electronegativity.
Describe what happens to this atom during ionic bond formation.
Please get it cleared and stored into your cerebrum that a cation is formed when a neutral atom loses one or more electrons from its valence electron shell.
However too, on other hand an anion is formed when a neutral atom gains one or more electrons in its outermost electron shell.
A cation means a positive ion
An anion means a negative ion
What is electronegativity?Electronegativity is one of physical periodicity and property of elements that describes the tendency of an atom to attract electrons toward itself.
Generally, electronegativity of an atoms of elements in a particular trend is affected by both its atomic number and the distance that its valence electrons reside from the charged nuclei.
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The molar mass of copper chloride is 134.45g/mol. How many formula units of copper chloride are present in 17.6g of copper chloride
Answer:
7.88 x 10²² formula units CuCl₂
Explanation:
To find the amount of formula units, you need to (1) convert grams to moles (via the molar mass) and then (2) convert moles to formula units (via Avogadro's Number). It is important to arrange the conversions in a way that allows for the cancellation of units. The final answer should have 3 sig figs to match the sig figs of the given value.
Molar Mass (CuCl₂): 134.45 g/mol
Avogadro's Number:
6.022 x 10²³ formula units = 1 mole
17.6 g CuCl₂ 1 mole 6.022 x 10²³ formula units
-------------------- x ----------------- x ------------------------------------------ =
134.45 g 1 mole
= 7.88 x 10²² formula units CuCl₂
The theory of plate tectonics describes the movement of the plates across the Earth's lithosphere (the crust and upper mantle) through immense periods of time. Earth's litoshphere is composed of 7 (or 8, depending on how they are defined) major plates and many more minor plates.
The movement is attributed to different phenomena stemming from Earth's rotation, gravity, and mantle dynamics. All of these forces play a role in influencing the size, shape, and positioning of the different landmasses that currently shape our continents and islands.
Earth's rotation, gravity, and mantle dynamics play greater role in reshaping the land of continents and Islands.
What factors influence the size, shape and position of land?Earth's rotation, gravity, and mantle dynamics are the forces that play a significant role in influencing the size, shape, and positioning of the different landmasses of our continents and islands. These forces are responsible for the change in shape of land masses with the passage of time.
So we can conclude that Earth's rotation, gravity, and mantle dynamics play greater role in reshaping the land of continents and Islands.
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Describes the movement of the plates across the Earth's lithosphere?
It takes 50.0 J to raise the temperature of an 10.6 g piece of unknown metal from 13.0°C to 24.9 °C.
What is the specific heat for the metal?
Express your answer with the appropriate units.
Answer:
0.396 J/g°C (to 3 sf)
Explanation:
50.0 = 10.6(24.9-13.0)(c)
c = 0.396 J/g°C (to 3 sf)
How are microfauna measured?
In centimeters
In millimeters
In nanometers
Any of the above
Microfauna are measured in all of the above units and is denoted as option D.
What is Microfauna?These are referred to as microscopic animals which lack mitochondrion and exists in the soil etc. The nematodes and protozoa are mostly common organisms among them.
Microfauna can be seen with the use of microscope and can be measured in centimeters, millimeters etc based on the size of their body structure.
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What volume of 0.555M KNO3 solution would contain 12.5 g of solute
The volume of 0.555M KNO3 solution would contain 12.5 g of solute iss 223 mL.
What is the relationship between mass of solute and concentration of solution?The mass of solute in a given volume of solution is related by the formula below:
Molarity = mass/(molar mass * volume)Therefore, volume of solution is given by:
Volume = Mass /molarity * molar mass
Molar mass of KNO₃ = 101 g/mol
Volume = 12.5/(0.555 * 101)
Volume = 0.223 L or 223 mL
In conclusion, the volume of the solution is obtained from the molarity of solution as well as mass and molar mass of solute.
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What mass of Ni2+ is produced in solution by passing a current of 67.0 A period od 14.0 h, assuming the cell is 86.0 % efficient?
883.15 gm of Ni is produced in solution by passing a current of 67 Ampere through a period of 14 hours.
Solution of the problem.Current, I = 67 A
Time, t = 14 h = (14×60×60) s
Now total Charge passed , Q = I t = 67×14×60×60 = 3376800 C
moles of electrons passed = [tex]\frac{Q}{96500}[/tex][tex]=\frac{3376800}{96500}=34.992[/tex] mole e⁻
34.992 moles of e⁻ will produce 34.992 /2 = 17.49 mole Ni
Now we have the reaction
Ni ²⁺ + 2e⁻ → Ni
34.992 moles of e⁻ produces 17.49 mole of Ni
mass of Ni produced = molar mass of Ni × moles of Ni = 58.693 × 17.49 = 1026.91 gm of Ni produced
But the cell is 86% efficient.
Therefore, Ni produced = 0.86×1026.91 = 883.15 gm
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Hydrogen peroxide is oxidized with permanganate solution to produce oxygen gas by the following reaction:
2H + H2O2 + 2MnO4 -> 2MnO2 + 4H2O + 3O2
In the lab a student mixed 30.0 mL of 0.30 M hydrogen peroxide solution with 30.0 mL of 0.30 M potassium permanganate solution. The oxygen that was produced was collected by water displacement at 298 K and 1.00 atm of pressure. The volume of oxygen collected was 178 mL. (Ignore the effect of water vapor in the collection tube here.)
a.) What is the limiting reactant?
b.) What is the theoretical yield of oxygen gas, in milliliters?
c.) What is the percent yield of oxygen gas?
The percentage yield of the oxygen gas is 60%.
What is the limiting reactant?The reaction equation is;
2H^+ + H2O2 + 2MnO4 -> 2MnO2 + 4H2O + 3O2
Number of moles of hydrogen peroxide = 30/1000 * 0.30 M = 9 * 10^-3 moles
Number of moles of potassium permanganate = 30/1000 * 0.30 M = 9 * 10^-3 moles
Now;
1 mole of H2O2 reacts with 2 moles of permanganate
9 * 10^-3 moles of H2O2 reacts with 9 * 10^-3 moles * 2 moles/1 mole
= 1.8 * 10^-2 moles
Hence, permanganate is the limiting reactant
b) The theoretical yield of oxygen is;
2 moles of oxygen produced 3 moles of O2
9 * 10^-3 moles oxygen produced 9 * 10^-3 moles * 3 moles/2 moles
= 0.0135 moles
If 1 mole of O2 occupies 22.4 L
0.0135 moles of O2 occupies 0.0135 moles * 22.4 L/ 1 mole
= 0.302 L or 302 mL
c) Percentage yield of oxygen = 178 mL/ 302 mL * 100/1
= 60%
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A methane molecule, CH4, in the stratosphere or (2) a CH3 molecule and a hydrogen atom formed from breaking one of the carbon‐hydrogen bonds in a CH4 molecule.
The methane molecule in the stratosphere has a higher potential energy than the CH₃ molecule and the hydrogen atom formed from breaking one of the carbon‐hydrogen bonds in a CH₄ molecule.
The complete question is:
For each of the following situations, you are asked which of two objects or substances has the higher energy. Explain your answer with reference to the capacity of each to do work and say whether the energy that distinguishes them is kinetic energy or potential energy.
a. (1) A methane molecule, CH4, in the stratosphere or (2) a CH3 molecule and a hydrogen atom formed from breaking one of the carbon-hydrogen bonds in a CH4 molecule.
Which have a higher energy?The methane molecule in the stratosphere is a stable molecule and possesses chemical potential energy.
The CH₃ molecule and the hydrogen atom formed from breaking one of the carbon‐hydrogen bonds in a CH₄ molecule are unstable molecules and possesses kinetic energy. However, some of their energy has been used in breaking the bond.
Thus, the methane molecule in the stratosphere has a higher potential energy than the CH₃ molecule and the hydrogen atom formed from breaking one of the carbon‐hydrogen bonds in a CH₄ molecule.
In conclusion, the energy in the methane molecule is higher.
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Given the balanced equation: 3 H2 + N2 2 NH3 ,
how many moles of NH3 will be produced if 50.8 g N2
reacts with 187.3 g H2?
Taking into account the reaction stoichiometry, 3.63 moles of NH₃ will be produced if 50.8 g N₂ reacts with 187.3 g H₂.
Reaction stoichiometryIn first place, the balanced reaction is:
3 H₂ + N₂ → 2 NH₃
By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:
H₂: 3 molesN₂: 1 mole NH₃: 2 molesThe molar mass of the compounds is:
H₂: 2 g/moleN₂: 28 g/moleNH₃: 31 g/moleThen, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:
H₂: 3 moles ×2 g/mole= 6 gramsN₂: 1 mole ×28 g/mole= 28 gramsNH₃: 2 moles ×31 g/mole= 62 gramsLimiting reagentThe limiting reagent is one that is consumed first in its entirety, determining the amount of product in the reaction. When the limiting reagent is finished, the chemical reaction will stop.
Limiting reagent in this caseTo determine the limiting reagent, it is possible to use a simple rule of three as follows: if by stoichiometry 6 grams of H₂ reacts with 28 grams of N₂, 187.3 grams of H₂ reacts with how much mass of N₂?
[tex]mass of N_{2} =\frac{187.3 grams of H_{2} x28 grams of N_{2}}{6 grams of H_{2}}[/tex]
mass of N₂= 874.067 grams
But 875.087 grams of N₂ are not available, 50.8 grams are available. Since you have less mass than you need to react with 187.3 grams of H₂, N₂ will be the limiting reagent.
Mass of NH₃ formedConsidering the limiting reagent, the following rule of three can be applied: if by reaction stoichiometry 28 grams of N₂ form 2 moles of NH₃, 50.8 grams of N₂ form how many moles of NH₃?
[tex]moles of NH_{3} =\frac{50.8 grams of N_{2} x2 moles of NH_{3} }{28 grams of N_{2}}[/tex]
moles of NH₃= 3.63 moles
Finally, 3.63 moles of NH₃ will be produced if 50.8 g N₂ reacts with 187.3 g H₂.
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The molar heat of fusion of gold is 12.550 kJ mol–1. At its melting point, how much mass of melted gold must solidify to release 235.0 kJ of energy?
The mass of melted gold to release the energy would be 3, 688. 8 Kg
How to determine the massWe have quantity of energy is;
Q = n × HF
n = number of moles
HF = heat of fusion
Let's find number of moles
235.0 = n × 12.550
number of moles = [tex]\frac{235}{12. 550}[/tex] = 18. 725 moles
Note that molar mass of Gold is 197g/ mol
Number of moles = mass/ molar mass
Mass = number of moles × molar mass
Mass = 18. 725 × 197
Mass = 3, 688. 8 Kg
Thus, the mass of melted gold to release the energy would be 3, 688. 8 Kg
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Minute maid states that a bottle of juice contains 473 ml. Consumer groups are interested in determining if the bottles contain less than the amount stated on the label. To test their claim, they sample 30 bottles. The sample mean was 472ml and the standard deviation is 0. 2. What does mu represent here?.
The term mu here represents the average contents of all bottles of juice in the population, which is unknown. Option B
What is the standard deviation?The term standard deviation has to do with the extent that values are scattered around the mean. Now we know that the mean is the average of the distribution.
The standard deviation shows the extent to which the values differ from the mean value of the distribution. It is a measure of dispersion.
Thus, the term mu here represents the average contents of all bottles of juice in the population, which is unknown. Option B
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Missing parts;
Minute Maid states that a bottle of juice contains 473 mL. Consumer groups are interested in determining if the bottles contain less than the amount stated on the label. To test their claim, they sample 30 bottles. The sample mean was 472mL and the standard deviation is 0.2.
What does mu represent here?
A. The average contents of all bottles of juice in the sample, which is unknown.
B. The average contents of all bottles of juice in the population, which is unknown.
C. The average contents of all bottles of juice in the population, which is 472mL.
D. The average contents of all bottles of juice in the sample, which is 472mL.
Do the following statement describe physical or chemical property!
Uranium is a radioactive element
The diagram shows the setup of an experiment. A few observations of the experiment are listed in table below the diagram.
Experimental Observations
Description
1. Color of solution turned blue
2. Shiny hair like crystals deposited on the copper strip
Which of the following is the correct explanation for one of the given observations?
Observation 1 is a result of silver ions moving into the solution.
Observation 2 is a result of nitrate ions moving into the solution.
Observation 1 is a result of silver ions changing their oxidation state.
Observation 2 is a result of silver ions changing their oxidation state.
The proper explanations to the observation are;
Observation 1 is a result of silver ions changing their oxidation state.Observation 2 is a result of silver ions changing their oxidation state.What is a redox reaction?A redox reaction is one in which a specie is oxidized while the other specie is reduced. In the first observation, the color of the solution turned blue and in the second observation, shiny hair like crystals deposited on the copper strip.
Hence;
Observation 1 is a result of silver ions changing their oxidation state.Observation 2 is a result of silver ions changing their oxidation state.Learn more about redox reaction:https://brainly.com/question/13293425
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