The mass of the solution will be 4,394 mg
Mass percentThe mass percent of a component in a solution can be derived as follows:
Mass percent = mass of component/total mass of solution x 100%
In this case, the mass percent of KCN in the solution is 0.208 and the mass of KCN is 914 mg.
The mass of the 0.208% KCN solution will be:
914/0.208 = 4,394 mg
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26.10 mL of a 0.250 M potassium carbonate solution is reacted with excess hydroiodic acid. How many grams of gas formed are in the balanced equation
Answer:
Below in bold.
Explanation:
The equation is:
K2CO3 + 2HCl ----> 2KCl + CO2 + H2O
So 1 mole of K2CO3 produces 1 mole of CO2.
Number of moles of K2CO3 in the solution
= 0.25 * 26.10 / 1000
= 0.00625 moles
This produces 0.00625 moles of CO2
which is 0.00625*44
= 0.2871 grams.
When enzyme activity rate has reached stability, an increase in the enzyme concentration will.
When enzyme activity rate has reached stability, an increase in the enzyme concentration will not make any difference in the enzyme rate.
What is an enzyme?Enzyme are proteins that act as biological catalysts.
How is enzyme activity measured?Enzyme activity is measured in micromoles of substrate converted (or product generated) per minute, which represents the rate of reaction catalyzed by that enzyme.
The activity an enzyme catalyzes in a reaction is a measure of how much of it is present. Numerous variables, including temperature, pH, and others, have an impact on the connection between activity and concentration.Every time an enzyme's concentration rises, so does its activity. This is as a result of the availability of additional enzymes to bind to the substrate. The reaction time quickens as a result. Increasing the concentration of the enzyme will quicken the reaction as long as there is a substrate for it to bind to.To learn more about enzyme activity visit:
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When enzyme activity rate has reached stability, an increase in the enzyme concentration will not make any difference in the enzyme rate.
What is an enzyme?
Enzymes are proteins that act as biological catalysts.
How is enzyme activity measured?Enzyme activity is measured in micromoles of substrate converted (or product generated) per minute, which represents the rate of reaction catalyzed by that enzyme.
The activity an enzyme catalyzes in a reaction is a measure of how much of it is present.Numerous variables, including temperature, pH, and others, have an impact on the connection between activity and concentration.Every time an enzyme's concentration rises, so does its activity.This is as a result of the availability of additional enzymes to bind to the substrate.The reaction time quickens as a result.Increasing the concentration of the enzyme will quicken the reaction as long as there is a substrate for it to bind to.To learn more about enzyme activity visit:
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potassium iodide lead (II) nitrtate -- lead (II) iodide potassium nitrtate , write as a balanced equation
For Lead (II) Nitrate + Potassium Iodide → Lead (II) Iodide + Potassium Nitrate , The balanced equation is [tex]Pb(NO_{3})_{2}[/tex] + 2KI -----> [tex]PbI_{2}[/tex] + 2 [tex]KNO_{3}[/tex]
We must first convert from a word equation to a symbol equation:
Lead (II) Nitrate + Potassium Iodide → Lead (II) Iodide + Potassium
Nitrate
The lead (II) ion is represented as [tex]Pb^{2+}[/tex] and nitrate ion as [tex]NO_{3} ^{-}[/tex]
We need two nitrate ions per lead (II) ion, so lead (II) nitrate is [tex]Pb(NO_{3})_{2}[/tex]
The potassium iodide is simply KI
In lead (II) iodide, the charges balance in a 1:2 ratio, so it is [tex]PbI_{2}[/tex]
And, potassium nitrate is simply [tex]KNO_{3}[/tex]
So, The symbol equation is as follows:
[tex]Pb(NO_{3})_{2}[/tex] + KI -----> [tex]PbI_{2}[/tex] + [tex]KNO_{3}[/tex]
Now, increase the number of nitrate ions on the right hand side of the equation as:
[tex]Pb(NO_{3})_{2}[/tex] + KI -----> [tex]PbI_{2}[/tex] + 2 [tex]KNO_{3}[/tex]
Now, balance the potassium ions on each side of the equation as:
[tex]Pb(NO_{3})_{2}[/tex] + 2KI -----> [tex]PbI_{2}[/tex] + 2 [tex]KNO_{3}[/tex]
Hence, the balanced equation is ;
[tex]Pb(NO_{3})_{2}[/tex] + 2KI -----> [tex]PbI_{2}[/tex] + 2 [tex]KNO_{3}[/tex]
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Which compound has both covalent and ionic bonds? pls give the explanation thx ：）
A NH3
B Na2SO4
C CH3COOH
D NaCl
Answer:
B.) Na₂SO₄
Explanation:
Covalent bonds are bonds which involve electrons being shared between two atoms. These bonds only occur between nonmetals.
Ionic bonds are bonds which involve electrons being given or taken by two atoms. These bonds form between a metal and a nonmetal.
NH₃ contains nitrogen and hydrogen, two nonmetals. Therefore, this molecule only contains covalent bonds.
Na₂SO₄ has both covalent and ionic bonds. The covalent bonds are found within the polyatomic ion, SO₄²⁻. Sulfur and oxygen are both nonmetals, thus covalently combining. The ionic bond forms between the Na⁺ and SO₄²⁻. Sodium (Na) is a metal which wishes to give up electrons to have a complete octet. SO₄²⁻ serves as the anion which it bonds with.
CH₃COOH contains hydrogen, carbon, and oxygen. All of these are nonmetals, thus the only bonds formed are covalent.
NaCl contains sodium, a metal, and chlorine, a nonmetal. Therefore, this compound is held together by an ionic bond.
Four students all do the same experiment for the science fair. They test reaction times for pushing a button when a specific color is shown. Their data is as follows: ⎡⎣⎢⎢⎢⎢⎢⎢⎢⎢⎢⎢Student 1Student 2Student 3Student 4Reaction Time (seconds)Trial 10.440.350.410.42Trial 20.410.430.520.43Trial 30.470.380.570.41Trial 40.390.390.460.42Trial 50.460.420.550.41Trial 60.420.440.490.42⎤⎦⎥⎥⎥⎥⎥⎥⎥⎥⎥⎥ Put the students in order from most to least reliable data. A. Student 3, Student 2, Student 1, Student 4 B. Student 2, Student 1, Student 4, Student 3 C. Student 4, Student 1, Student 2, Student 3 D. Student 1, Student 2, Student 3, Student 4
The order of the students from the most reliable to the least reliable is C. Student 4, Student 1, Student 2, Student 3.
what student has the most reliable data?the student with the most reliable data is the one that has the least variation in their data in the various trials.
this student is therefore student 4.
the next student would be student 1 and student 2 would be the third most reliable.
student 3 has large variations in their trials which makes their data the least reliable.
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Managing large amounts of data and processing them quickly during communication between Earth and space is challenging. Which technology is most suitable to overcome this challenge
Utilizing wireless communication and camera imagery is the most effective technological solution to this problem.
To find the answer, we need to know more about the wireless communication and camera imagery
Wireless communication is what?The transmission of data or information between two or more sites without the use of an electrical conductor is known as wireless communication.It is difficult to manage enormous amounts of data and analyze them fast when communicating between Earth and space.Today, wireless connections are used to access the internet.Thus, we can conclude that, the wireless connectivity and camera imaging method meet this obstacle.
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Describe the effect of leaving the following substances in humid air
a) anhydrous copper (ii) sulphate
Answer:
the effect of leaving the following substances in humid air is
ii) sulphate
how many moles are in 2.00g of H2O
n = m/M = 2/18 = 1/9 ~0,1 mol
Answer:
.111 mole (using 3 significant digits)
Explanation:
Mole weight of H2O = 2 x 1.008 + 15.999 = 18.015 gm/mole
2 gm / 18.015 gm/mole = .111 mole
How many moles of hcl are required to make 500 ml of a 3.0 mol/l solution of hcl?
Answer:
1.5 moles
Explanation:
To find the number of moles of HCl in 500 mL of a 3 M solution of HCl, we consider moles in 1 liter/ 1000 mL.
3 moles HCl is contained in 1000 mL
x moles is HCl is contained in 500 mL
[tex] = \frac{3 \: \times \: 500}{1000} \: moles \\ = 1.5 \: moles[/tex]
Hence the number of moles of HCl in 500 mL is 1.5 moles.
State whether it would be worthwhile to investigate finding a catalyst to use in this reaction under standard conditions and explain why?.
Yes, it will be worthwhile to investigate finding a catalyst to use in this reaction under standard conditions because it is negative.
What is a Catalyst?This is a substance which speeds up the rate of a chemical reaction by lowering the activation energy.
ΔG being negative indicates a a slow reaction which is why a catalyst under standard conditions should be used.
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A hydrogen bond can occur between:
A. Two hydrogen atoms on different molecules.
B. Two oxygen atom surrounded by hydrogens.
C. The two hydrogen atoms on a water molecule.
D. A hydrogen from one molecule and an oxygen from another molecule.
A hydrogen bond occurs between a hydrogen from one molecule and an oxygen from another molecule. Option D
What is the hydrogen bond?The hydrogen bond is one that is responsible for association in molecules. It occurs when hydrogen is covalently bonded to a highly electronegative element such as oxygen, nitrogen or Sulphur.
Thus, a hydrogen bond occurs between a hydrogen from one molecule and an oxygen from another molecule. Option D
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A positive correlation ______ a causal link, and a negative correlation ______ a causal link.
A. does not necessarily indicate, does not necessarily indicate
B. does not necessarily indicate, always indicates
C. always indicates, does not necessarily indicate
D. always indicates, always indicates
A positive correlation does not necessarily indicate a causal link, and a negative correlation does not necessarily indicate a causal link. Option A
What is correlation?In research, correlation often indicates that some kind of relationship does exist between the variables. This does not actually mean causation. The correlation could be positive or negative.
It should be known that; a positive correlation does not necessarily indicate a causal link, and a negative correlation does not necessarily indicate a causal link. Option A
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How many moles of electrons are transferred when the two half-reactions shown below are combined to generate the spontaneous balanced chemical reaction with the lowest possible integer coefficients
6 moles of e- are transferred when the two half-reactions shown below are combined to generate the spontaneous reaction with the lowest possible integer coefficients
A spontaneous reaction is one that favors the creation of products under the reaction's current conditions. A bonfire that is raging and exothermic is an illustration of a spontaneous reaction (there is a decrease in the energy of the system as energy is released to the surroundings as heat)
A redox reaction's oxidation or reduction reaction component is known as a half-reaction (or half-cell reaction). By taking into account the shift in oxidation states of the many chemicals participating in the redox reaction, a half-reaction is obtained. At each electrode, there are two chemical reactions taking on in the cell. Half-reactions are what we refer to as. An oxidation reaction that releases electrons occurs at the anode.
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What is the molar solubility of AgCl in a 0.050 M NaCl solution? The Ksp of AgCl is 1.6 x 10-10. (Assume that the contribution of [Cl-] from AgCl is negligible relative to the [Cl-] from NaCl)
The molar solubility of AgCl:
The molar solubility of AgCl in a 0.050 M NaCl solution is 8 x [tex]10^{-8}[/tex] M [tex]Ag^{+}[/tex]
What is solubility?
The solubility is the quantity of reagent required to saturate the solution or bring about the dissociation reaction's equilibrium.
Reaction:
The dissociation reaction of AgCl in water is:
[tex]AgCl[/tex] ⇄ [tex]Ag^{+} + Cl^{-}[/tex]
Each mole of AgCl that dissolves in this reaction yields 1 mole of both [tex]Ag^{+}[/tex] and [tex]Cl^{-}[/tex]. The concentration of either the Ag or Cl ions would then be equal to the solubility.
Solubility= [[tex]Ag^{+}[/tex]] = [[tex]Cl^{-}[/tex]]
Calculation:
in 0.050 M NaCl, the [[tex]Cl^{-}[/tex]] = 1 x [tex]10^{-2}[/tex]
ksp = [[tex]Ag^{+}[/tex]] x [[tex]Cl^{-}[/tex]]
1.6 x [tex]10^{-10}[/tex] = [[tex]Ag{+}[/tex]] x ( 5 x [tex]10^{-2}[/tex])
[[tex]Ag^{+}[/tex]] = 5 x [tex]10^{+2}[/tex] x 1.6 x [tex]10^{-10}[/tex]
[[tex]Ag^{+}[/tex]] = 5 x 1.6 x [tex]10^{-10+2}[/tex]
[[tex]Ag^{+}[/tex]] = 8 x [tex]10^{-8}[/tex] M
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What is the best way to maintain control of the subsection when cutting with a vertical or diagonal cutting line
Palm to palm is referred to as the best way to maintain control of the subsection when cutting with a vertical or diagonal cutting line thereby preventing the risk of injuries or inaccuracy.
What is Palm to palm technique?This method is used during cutting or styling and involves the two palms of the hands in a position such that they are facing each other or opposite to one another and helps to reduce the different types of strain in the affected part of the body.
This method isn't a compulsory one to be done but is best suited for an individual who wants to maintain control of the subsection when cutting with a vertical or diagonal cutting line.
This is therefore the main reason why palm-to palm technique was chosen as the most appropriate choice.
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uppose the reaction Ca3(PO4)2 + 3H2SO4 ï‚® 3CaSO4 + 2H3PO4 is carried out starting with 153 g of Ca3(PO4)2 and 87.6 g of H2SO4. How much phosphoric acid will be produced?
The answer is 58.4 g of H₃PO₄
Given that mass of Ca₃(PO₄)₂ is 153g
mass of H₂SO₄ is 87.6g
We need to calculate the mass of H₃PO₄
So the balanced chemical reaction is
Ca₃(PO₄)₂ + 3H₂SO₄ ⇒ 3CaSO₄ + 2H₃PO₄
Let us calculate the molar mass of the reactants
Ca₃(PO₄)₂ = (3 x 40) + (2 x 31) + (8 x 16)
= 120 + 62 + 128
= 310 g
H₂SO₄ = (1 x 2) + (32 x 1) + (16 x 4)
= 2 + 32 + 64
= 98 g
Now let us calculate the limiting reactant
The Theoretical Yield = Ca₃(PO₄)₂ / H₂SO₄
= 310 / 3(98)
= 1.05
The Experimental yield
Ca₃(PO₄)₂ / H₂SO₄
= 153 / 87.6 = 1.74
Because the observed percentage was more than the predicted proportion, H2SO4 is the limiting reactant.
Let us Calculate the molar mass of H₃PO₄
H₃PO₄ = (1 x 3) + (31 x 1) + (16 x 4)
= 3 + 31 + 64
= 98 g
Now Calculate the mass of H₃PO₄
3(98) g of H₂SO₄ ------------------ 2(98) g of H₃PO₄
87.6 g of H₂SO₄ ------------------ x
x = ( 87.6 x 2 x 98) / (3 x 98)
x = 17169.6 / 294
x = 58.4g of H₃PO₄
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Comparison of IR of starting materials (given in the lecture) to IR of product What indicates the purity of the product on the IR spectrum of product
The Old Way
If the peaks matched those of known impurities, they could use the intensities to calculate the purity of the ester.
What is IR Spectrum ?IR-spectroscopy is perhaps the most frequently used technique in the organic chemistry labs at PSU. It is routinely used to identify products and to verify that an experiment has succeeded.
An IR -spectrum routinely shows peaks from the range of 3600 to 500 cm-1. IR -frequencies correspond to the frequencies of molecular vibrations. The IR spectrum can be used to show that there is not any starting material left by the loos of the alkene bond(C=C) between 1500cm^-1 and 1800cm^1 from 1-hexene and the addition of a hydroxyl group(-OH) of 2-Hexanol between 3000cm^-1 and 3300cm^-1.Learn more about IR Spectrum here:
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A balloon filled with air has a volume of 4.24 liters at 23.00°c. if the balloon is cooled at constant pressure to 5.00°c, what is its new volume? the balloon’s volume at 5°c is liters.
The new volume if the balloon is cooled at constant pressure is 3.98 L.
Charles's law, states that the volume occupied by a fixed amount of gas is directly proportional to its absolute temperature if the pressure remains constant.
The new volume is calculated using the Charles law formula
V₁ / T₁ = V₂ / T₂
where,
V₁ = The initial volume of air = 4.24 l
T₁ = 23.00 °C into kelvin = 23 +273 =296 K
T₂ = 5.00 °C into kelvin = 5.00 + 273 = 278 K
V₂ = ?
By making V₂ subject the subject of the formula by multiplying both sides by T₂
V₂ = ( V₁ × T₂ ) / T₁
V₂ = (4.24 L × 278 K) / 296 k
= 3.98 L
Therefore, the new volume, if the balloon is cooled at constant pressure, is 3.98 L.
An air-filled balloon will contract when chilled and expand when heated. This occurs because the gas that makes up the air within the balloon expands when it is warm and contracts when it is cool.
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Answer: at 5 its ... 3.98
Explanation:
Explain why the production of a gas in this experiment is or is not different from the formation of water vapor in the heating curve experiment.
The production of a gas is different because unlike the heating curve, there was no heat applied to this experiment, and the experiment was a chemical reaction.
What is a Heating curve?This shows the relationship between the temperature of the heating system and the air temperature in the outer environment.
The chemical reaction emitted heat as against the other which involved heat application which is why water formation in this curve was different.
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If a car travels 300 kilometers in 3 hours, its average speed is 100 km/hr.
true or false
Answer:
speed=distance/time taken
=300km/3hr
=100km/hr
So it is true.
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By now you should realize that having an octet of electrons on a central atom is critical for a molecule to be stable. Would you expect NO and NO2 to be stable molecules
NO is a stable compound
The octet rule describes an atom's propensity to favor eight electrons in its valence shell. Atoms with fewer than eight electrons are more likely to interact with one another and create a more stable compound.
The majority of other odd-electron molecules, including NO, are highly chemically reactive and stable compounds. The second breach of the octet rule is the presence of molecules lacking electrons. Less than eight electrons are positioned around each atom in these stable compounds.
The overall molecular orbital arrangement of NO will be as follows, nitrogen has 7 electrons and oxygen has 8 electrons, according to the molecular orbital theory.
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Carbon dioxide and water are produced when ethanol, C2H5OH, is burned in oxygen. The number of moles of CO2 that is produced when burning 6.0 mol of ethanol is
The number of moles of CO₂ that is produced when burning 6.0 mol of ethanol is 12 mol.
What is Balanced Chemical Equation ?The balanced chemical equation is the equation in which the number of atoms on the reactant side is equal to the number of atoms on the product side in an equation.
Now we have to write the balanced equation
C₂H₅OH + 3O₂ → 2CO₂ + 3H₂O
We can see that every 1 mole of ethanol we will get 2 mole of CO₂.
So 6.0 mol of ethanol we will get = 6.0 × 2.0
= 12 mol of CO₂
Thus from the above conclusion we can say that The number of moles of CO₂ that is produced when burning 6.0 mol of ethanol is 12 mol.
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To a 25.00 mL volumetric flask, a lab technician adds a 0.225 g sample of a weak monoprotic acid, HA , and dilutes to the mark with distilled water. The technician then titrates this weak acid solution with 0.0849 M KOH . She reaches the endpoint after adding 42.35 mL of the KOH solution. Determine the number of moles of the weak acid in the solution.
The number of moles of the weak acid in the solution is 0.00359
Calculation:
1. The number of mole of KOH in the solution:
Given:
Molarity of KOH = 0.0849 M
Volume = 42.35 mL = 42.35 / 1000 = 0.04235 L
Mole of KOH = Mole = Molarity x Volume
= 0.0849 × 0.04235
= 0.00359 mole
2. The number of mole of a weak acid, HA:
Balanced equation:
HA + KOH → KA + H₂O
From the above equation, A mole of HA and a mole of KOH react together. Therefore,
0.00359 moles of HA will also react with 0.00359 moles of KOH.
0.00359 moles of base use = 1/1 x 0.00359 = 0.00359 moles of HA
Thus, there are 0.00359 moles of a weak acid in the solution.
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The procedure calls for 2.0 ml of concentrated nitric acid. how many moles is this?
Answer:
ρHNO₃= 1.51 g/cm3
ρ = m/V
m = ρ x V
m = (1.51 g/cm3)(2 cm3)= 3.02 g de HNO₃
n = m/PM = 3.02 g/63.01 g/mol = 0.0479 mol de HNO₃
Explanation:
2 mL of concentrated nitric acid equals 0.0479 mol
How many moles of water are
in 1.23x10¹8 water molecules?
[ ? ]×10[?]
Answer:
2.04 x 10⁻⁶ moles H₂O
Explanation:
To find the moles H₂O, you need to multiply the given value by Avogadro's Number. This number is a ratio between molecules and moles, thus granting you the way to convert between both units. It is important to arrange the ratio 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 (1.23 x 10¹⁸ molecules).
Avogadro's Number:
6.022 x 10²³ molecules = 1 mole
1.23 x 10¹⁸ molecules H₂O 1 mole
--------------------------------------- x ------------------------------------- =
6.022 x 10²³ molecules
= 2.04 x 10⁻⁶ moles H₂O
At a particular temperature, the solubility of Kr in water is 0.060 M when the partial pressure is 0.90 atm. What partial pressure (in atm) of Kr would give a solubility of 0.150 M
At a particular temperature, the solubility of He in water is 0.060 M when the partial pressure is 0.90 atm. 2.27 atm is the partial pressure of Kr would give a solubility of 0.150 M.
What is Henry's Law ?According to Henry's law, the weight of a gas dissolved by a liquid is proportional to the pressure of the gas onto the liquid.With very few exceptions, a solute molecule in an extremely diluted solution will only have solvent molecules as its close neighbors. This means that the likelihood that a specific solute molecule will escape into the gas phase is predicted to be independent of the total concentration of solute molecules.Solution:
The solubility of gas is directly proportional to partial pressure. It is expressed as:
S = [tex]K_ h \times P _g_a_s[/tex]
where, S = Solubility of gas
[tex]K_h[/tex] = Henry's Law constant
[tex]P_g_a_s[/tex] = Partial pressure of gas
Now, put the values in above expression we get
0.060M = [tex]K_h[/tex] × 0.9 atm
[tex]K_h[/tex] = = 0.066 M/atm
Now we have to find the partial pressure of He
0.150 M = 0.066 M/atm × [tex]P_g_a_s[/tex]
[tex]P_g_a_s[/tex] = 2.27 atm
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What, approximately, is the highest concentration of co2 measured in the earth's atmosphere in modern times?
In modern times the highest concentration of [tex]CO_{2}[/tex] measured in the earth's atmosphere is 400 ppm.
The concentration of the [tex]CO_{2}[/tex] which is also refereed as global annual is increased by 50%.The rise in concentration of the [tex]CO_{2}[/tex] start from 280 ppm during [tex]10^{4}[/tex] years up to the mid-18th century to 421 ppm as of May 2022.The reason behind the rise of concentration of the [tex]CO_{2}[/tex] is the Industrial Revolution.The concentration of the [tex]CO_{2}[/tex] is rises in such pace the it is very dangerous for human health and environment.Learn about global annual
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A substance crystallizes with one atom at each corner, one atom on 8 of the edges, and one atom on 6 of the faces. How many atoms are present in one unit cell
The number of atoms in one unit cell with one atom at each corner, one atom on 8 of the edges, and one atom on 6 of the faces are 4.6atoms.
There is one atom at each corner and there are 8 corners in a unit cell, so there is one atom in each of the eight corners.
Therefore, the number of atom from corners = 1 x 1/8 = 1atom
There are 12 edges, since there are one atom on 8 of the edges the number of atom = 1 x 8/12 = 0.6atom
There is one atom at each face and there are 6 faces in a unit cell, each atom shares two face.
Therefore, the number of atoms on face = 2 x 1/6 = 3
Total number of atoms in one unit cell = 1 + 0.6 + 3 = 4.6atoms
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What could the fourth quantum number of a 3p3 electron be?
A. ms=-1/2
B. ms=-1
C. ms=+1
D. ms=0
Each coin has a mass of 21.94 g and a volume of 2 mL which of the following metals are the coins made of
Answer:
A.
Explanation:
The density of each element represents the mass (grams) per every 1 milliliter Therefore, if each coin is 2 milliliters, you need to divide the given mass by 2.
21.94 grams / 2 mL = 10.97 grams / 1 mL
This matches the density of silver.