Each Hydrogen atom has 1 valence electron. Since Hydrogen can only fit a max of 2 valence electrons in its orbital, each Hydrogen atom only needs 1 electron. Each atom has 1 valence electron, so they can just share, giving each atom two electrons each.
I need help on this question please. This is not graded. Thank you.
A gas has a pressure of 32,541 kPa at 40.0°C. what is the temperature at standard pressure
2. Balance these chemical equations.
(a) SO₂ + O₂SO3
(b) NH3 + O₂N₂ + H₂O
(c) C4H10+ O₂ CO₂ + H₂O
(d) Pb(NO3)2 →PbO + NO₂ + O₂
(e) Al + Fe3O4 →→→ Al₂O3 + Fe
(f) Sr + H₂O-Sr(OH)₂ + H₂
The balanced chemical equation is [tex]\rm 2SO_2 + O_2 \rightarrow 2SO_3[/tex].
What is balanced chemical equation?Balanced chemical equation is defined as a formula where both the reactants and the products have the same amount of atoms of each kind. The law of conservation of mass stipulates that mass cannot be generated or destroyed, hence a chemical equation must always be in balance.
The balanced chemical equation are
[tex]\rm 4NH_3 + 3O_2 \rightarrow 2N_2 + 6H_2O[/tex]
[tex]\rm C_4H_1_0+ 5O_2 \rightarrow 4CO_2 + 5H_2O[/tex]
[tex]\rm 2Pb(NO_3)_2 \rightarrow 2PbO + 4NO_2 + O_2[/tex]
[tex]\rm 8Al + 3Fe_3O_4 \rightarrow 4Al_2O_3 + 9Fe[/tex]
[tex]\rm Sr + 2H_2O \rightarrow Sr(OH)_2 + H_2[/tex]
Thus, balancing the chemical equation is very important as per the law.
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Which of the following best describes temperature:
A: number of molecules
B:motion of molecules
C:size of molecules
D:type of molecules
A local AM radio station broadcasts at a frequency of 587 kHz.
Calculate the wavelength at which it is broadcasting.
Wavelength =
Explanation:
c=v * lambada
lambda= 3*10power of 8m/s ÷587×10power of 3 hzExplain why we need to do
electrolysis of sodium chloride BEFORE we do electrolysis of copper chloride.
Answer:
When melted at high temperature, sodium chlorideseparates into sodium and chloride ions, so that, electrolysis can take place to form sodium atom and chlorine gas .
Oxygen gas reacts with powdered aluminum according to the following reaction:
4Al(s)+3O2(g)→2Al2O3(s)
What volume of O2 gas (in L), measured at 792 mmHg and 23 ∘C, is required to completely react with 52.6 g of Al?
The volume (in L) of O₂ gas, measured at 792 mmHg and 23 °C, that is required to completely react with 52.6 g of Al is 34.14 L
How to determine the volume of O₂We'll begin by obtaining the mole of O₂ that reacted. This can be obtained as follow:
Mass of Al = 52.6 gMolar mass of Al = 27 g/molMole of Al = mass / molar mass = 52.6 / 27 = 1.948 mole4Al(s) + 3O₂(g) → 2Al₂O₃(s)
From the balanced equation above,
4 moles of Al reacted with 3 moles of O₂
Therefore,
1.948 moles of Al will react with = (1.948 × 3) / 4 = 1.461 mole
Finally, we shall determine the volume of the O₂ required. Details below
Mole of O₂ (n) = 1.461 moles Pressure (P) = 792 mmHg = 792 / 760 = 1.042 atm Temperature (T) = 23 °C = 23 + 273 = 296 KGas constant (R) = 0.0821 atm.L/Kmol Volume (V) =?PV = nRT
1.042 × V = 1.461 × 0.0821 × 296
Divide both sides by 1.04
V = (1.461 × 0.0821 × 296) / 1.04
V = 34.14 L
Thus, the volume required is 34.14 L
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I really need help!
I promise I've been paying attention, it just goes in one ear and out the other ;-;
(question is in picture!)
Answer: the balanced equation is the same.
Explanation:
Every element must have the same number of atoms on each side of the equation (law of conservation of mass).
2. Balancing the equation can be done only by adjusting the coefficients.
C
is a balanced element because there is the same number of atoms of
C
in each side of the equation.
C
is a balanced element
H
is a balanced element because there is the same number of atoms of
H
in each side of the equation.
H
is a balanced element
O
is a balanced element because there is the same number of atoms of
O
in each side of the equation. O is a balanced element. Na is a balanced element because there is the same number of atoms of Na on each side of the equation. Na is a balanced element H is a balanced element because there is the same number of atoms of H on each side of the equation. H is a balanced element C is a balanced element because there is the same number of atoms on each side of the equation. C is a balanced element. O
is a balanced element because there is the same number of atoms of
O in each side of the equation. O is a balanced element. All elements have the same number of atoms on each side of the equation, which means that the law of conservation of mass is satisfied and thus the chemical equation is balanced.
B
Which compound has the highest melting point?
O Al₂(CO3)3
O C12H22011
OC8H18
O H₂O
Al₂(CO3)3 has the highest melting point. Aluminum carbonate has melting point of 58 degree Celsius.
Why melting point of aluminum is high?The strength of the metallic connection affects a metal's melting point.If aluminum has a greater melting point than magnesium, it probably has a stronger metallic bond.Positive ions and electrons in aluminum would be more attracted to one another, maintaining the structure's stability and resistance to heat.What are uses of aluminum carbonate?A phosphate-binding medication known as aluminum carbonate, aluminum hydroxide, and aluminum oxide is occasionally given to dogs and cats to bind intestinal phosphate, stop the absorption of food phosphate, and reduce the absorption of phosphate excreted by the pancreas. Due to safety issues, it is rarely utilized in people, although cats and dogs don't seem to react negatively to its presence.For more information on melting point kindly visit to
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When fossil fuels, such as gasoline, are burned, they create smoke. Smoke is best described as a heterogeneous mixture of solid particles from the burning fuel dispersed in a gas – usually air. Smoke can be described more specifically as a suspension.
What will most likely happen over time to smoke in the atmosphere?
A.The solid particles will spread out and dissolve.
b.The particles will eventually come together in a cloud and produce rain.
c.Over time, the solid particles will settle on whatever is outside.
d.The particles will remain mixed in the air.
The most likely will happen to smoke in the atmosphere is over time, the solid particles will settle on whatever is outside (Option C).
What is smoke?Smoke can be defined as any group or mixture of small particles that may be present in different states of matter in the air (i.e., in the solid state, liquid state and or gas state), generally composed of burning fossil fuels or carbon.
Therefore, with this data, we can see that smoke is generally composed of carbon but it is also represented by other types of particles in suspension in the atmosphere.
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What is the name of the compound CH3CH(CH3)C(CH3)3?
tetramethylpropane
2,2,3-trimethylbutane
isoheptane
1,1,1,2-tetramethylpropane
The molecular formula for the compound in the task given above is 2,2,3-trimethylbutane.
The correct answer choice is option b.
What is meant by the name or the molecular formula of a compound?The molecular formula of a compound is the name of the compound derived from its structural formula. From the task given above, the parent chain is butane. There are three different substituents groups; 2 different methyl group on carbon 2 and another methyl substituent at carbon 3.
The image to further illustrate the solution to the above problem is attached.
That being said, organic compounds are those compounds which contains carbon and hydrogen.
In conclusion, from the detailed explanation above, it can be deduced that the name of the compound above is 2,2,3-trimethylbutane
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One of the main components of an airbag is the gas that fills it. As part of the design process, you need to
determine the exact amount of nitrogen that should be produced. Calculate the number of moles of
nitrogen required to fill the airbag. Show your work. Assume that the nitrogen produced by the chemical
reaction is at a temperature of 495°C and that nitrogen gas behaves like an ideal gas. Use this fact sheet
u to review the ideal gas law.
The number of moles of the gas is 0.016 moles
The airbag reaction is the nitrogen gas obtained by the decomposition of sodium azide and the reaction is
2NaN₃ → 2Na + 3N₂
Then it is under ideal condition
P = 1atm
V = 1L
T = 495°C or 768 K
n = ?
We have to calculate moles of nitrogen = ?
R = 0.082 atm LK⁻¹mol⁻¹
So the formula is
PV =nRT
n = PV/RT
n = 1 atm×1L/0.082 atm LK⁻¹mol⁻¹×768 K
n = 0.016 moles
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The greatest distance across the moon's orbit is 772,000 km; the eccentricity of its orbit is 0.055. How far
apart are the foci of the moon's orbit?
14036363. 64 kmThe distance apart are the foci of the moon's orbit.
The Moon is Earth's handiest natural satellite tv for pc. it's miles the fifth largest satellite within the solar gadget and the biggest and big relative to its parent planet, with a diameter about one zone that of Earth.
The foci of the moon's orbit = 772,000 km/ 0.055
= 14036363. 64 km.
The Moon takes approximately one month to orbit Earth (27. three days to finish a revolution, but 29.5 days to alternate from New Moon to New Moon). because the Moon completes each 27. three-day orbit around Earth, each Earth, and the Moon are transferring across the solar.
The Moon orbits Earth inside the same course as our planet rotates. So, the Moon clearly acts from west to east through our sky, albeit so slowly that we almost by no means note it.
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The sun, moon, and planets of the solar system are shown with their orbits.
The loops in Ptolemy’s model, and those shown on the video, are called motion.
This phenomenon is caused by Earth’s orbit than those of other planets.
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Answer: 1 one is B 2 one is C 3 one is A
The sun, moon, and planets of the solar system are shown with their orbits.
The loops in Ptolemy’s
1 one
A retrograde
B geocentric
C retrograde
model, and those shown on the video, are called
2 one
A heliocentric
B geocentric
C retrograde
motion.
This phenomenon is caused by Earth’s
3 one
A faster
B slower
C larger
orbit than those of other planets.
What summarizes the process of cellular respiration in plants and animals
In both plants and animals, the process of cellular respiration may be broken down into the following steps: Oxygen + carbon dioxide.
When plant cells undergo cellular respiration, oxygen is taken in through the plant's leaves from the surrounding atmosphere, and carbon dioxide is exhaled back into the atmosphere as a byproduct of the process. In contrast, when animal cells undergo cellular respiration, oxygen is taken in through the lungs, and carbon dioxide is exhaled through the lungs.
Therefore, a quick review, throughout the process of cellular respiration, plants and animals trade oxygen and carbon dioxide with one another.
Therefore, we may draw the following conclusion: Oxygen + carbon dioxide is a shorthand for the process of cellular respiration in plants and animals.
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thsof
is which acid H2S04
Explanation:
H2So4=sulphuric acid , strong acid
1 gram of hydrogen ALWAYS reacts with 8 grams of oxygen. Precious mixes 2g of hydrogen with 20g of oxygen. (i) How much water is formed? [2
Answer:
18g
Explanation:
1g H + 8g O = 9g H2O since H is limiting factor
Calculate the mass percent of the following solution: 65g of KCl in 46.6g of water
Considering the definition of mass percent, the mass percent of a solution of 65g of KCl in 46.6g of water is 58.24%.
Mass percentThe mass percent is a measure of the amount of mass that an element occupies in a compound and indicates the percentage by mass of each element that is part of a compound.
The mass percent is calculated as the mass of the solute divided by the mass of the solution, the result of which is multiplied by 100 to give a percentage. This is:
mass percent= (mass of solute÷ mass of solution)× 100%
Mass percent in this caseIn this case, you know:
mass of solute (KCl)= 65 gmass of water= 46.6 gmass of solution= mass of solute + mass of water= 65 gr + 46.6 g= 111.6 gReplacing in the definition of mass percent:
mass percent= (65 g÷ 111.6 g)× 100%
Solving:
mass percent= 58.24%
Finally, the mass percent is 58.24%.
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3 Mg + 1 Fe2O3 --> 2 Fe + 3 MgO
How many grams of magnesium oxide are made from 5.6 grams of magnesium and 10.0 grams of iron (III) oxide ?
The mass of the magnesium oxide will produce is equal to 9.32 grams
What is a limiting reagent?A limiting reagent can be described as the reactant in the chemical reaction which is consumed first during the completion of a chemical reaction.
The limiting reagent decides the yield of the product when the amount of the reactants is not taken in stoichiometry.
Given, chemical reaction of magnesium and iron oxide is:
[tex]3 Mg + 1 Fe_2O_3 \longrightarrow2 Fe + 3 MgO[/tex]
The mass of the magnesium = 5.6 g
The number of moles of Mg = 5.6/24 = 0.233
The mass of the iron oxide = 10 g
The number of moles of Mg = 10/103.8 = 0.096
The 3 moles of Mg react with iron oxide = 1
Then 0.233 moles of Mg react with iron oxide = 0.233/3 = 0.077
Therefore magnesium is a limiting reagent.
The 0.233 moles of Mg will produce magnesium oxide 0.233 moles.
The mass of the magnesium oxide = 0.233 × 40 = 9.32 g
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At a crime scene, Lorenzo finds a gun in shallow pond water. How should he transport the gun to BEST preserve the evidence?
A.
He should drain the water and then put the gun in a plastic bag.
B.
He should rinse the gun, dry it, and then put it in a paper bag.
C.
He should clean the gun and collect a separate water sample.
D.
He should keep the gun submerged in water as he transports it.
Answer:d
Explanation:
Hydrogen atoms absorb energy so that electrons can be excited to the n = 6 energy level. Electrons then undergo these transitions, among others: (a) n = 4 → n = 3 (b) n = 6 → n = 3 (c) n = 5 → n = 4 (i) Which transition produces a photon with the least energy? (ii) Which transition produces a photon with the highest frequency? (iii) Which transition produces a photon with the shortest wavelength?
1) The transition that produces the least energy is n = 4 → n = 3
2) The transition that produces a photon with the highest frequency is n = 6 → n = 3
3) The transition that produces a photon with the shortest wavelength n = 4 → n = 3
What is the Bohr model?We know from the Bohr model that an electron that is found in the hydrogen atom can be moved from a lower to a higher energy level and that would happen when the electron is able to absorb energy in the form of visible light.
Looking at the transitions as we have it here, we can see that the photon that would photons produce the least energy would be two levels that are closest together.
Also, the photon that would have the highest frequency is the photon that is involved in the transition that has the furthest energy apart from each other.
The transition that produces a photon with the shortest wavelength must also be farthest apart in energy.
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You react 4.16g of sodium hydroxide with 5.81g hydrochloric acid according to the following reaction you produce 5.79 g of sodium chloride. What is your percent yield?
The limiting reactant in the reaction is NaOH. one mole or 40 g of NaOH gives 58.5 g of NaCl. Thus, 4.16 g have to give 6.08 g but the actual yield is 5.79 g. Thus the percent yield of the reaction is 95%.
What is percent yield?Percent yield of a reaction is the ratio of actual yield to the theoretical yield multiplied by 100.
The molar mass of NaOH is 40 g/mol. Thus number of moles of NaOH is 4.16 /40 = 0.10 moles. Similarly the molar mass of HCl is 36.5 g/mol and number of moles in 5.81 g is 5.81/ 36.5 = 0.15 moles.
One mole of HCl needs 1 mole of NaOH, thus 0.15 moles need 0.15 moles NaOH but we have 0.1 only. Thus, NaOH is the limiting reactant.
40 g of NaOH gives 58.5 g of NaCl (1 mole). Thus the theoretical yield for 4.16 g of NaOH is :
= ( 4.16 × 58.5 )/40
= 6.04 g.
The actual yield is 5.79 g. Thus percent yield =(5.79/6.04) × 100 = 95%.
Hence, the percent yield of the reaction is 95%.
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Consider two mixtures of gases available for use to fill a tire. One has the same composition as air (Gas 1: 20% O₂, 80% N₂) and
another has added carbon dioxide (Gas 2: 15% O₂, 80% N₂, 5% CO ₂ ). Compare the partial pressure of nitrogen gas in a 2L sample of
Gas 1 at sea level (1 atm) to the partial pressure of nitrogen gas in a 2L sample of Gas 2 at sea level. Explain your answer.
The partial pressure of nitrogen gas in 2L sample of gas 1 and gas 2 are equal.
The overall pressure exerted by a mixture of gases is equal to the sum of the partial pressures exerted by each individual gas in the mixture, according to Dalton's law of partial pressures, a gas law.
P'=X° ×Pt ( P' = partial pressure , Xi = mole fraction , Pt= Total pressure )
Gas 1 ( ∵1 mole of gas = 22.4L)
Nitrogen moles = 80% × 2L / 22.4L
=8/5x22.4L
Oxygen moles = 20% ×2L /22.4L
2/5 × 22.4l
Mole fraction of nitrogen = (8/5 ×22.4L) ÷ (8/5 ×22.4L+ 2/5x22.4L)
=4/5
Partial pressure of nitrogen at 1 atm = 4/5 * 1
=4/5
Similarly Gas 2
Nitrogen moles = 80% × 2L / 22.4L
=16/10 × 22.4L
Oxygen moles = 15% × 2L /22.4L
3/10 × 22.4l
Carbon dioxide moles = 5% × 2L /22.4L
1/10 × 22.4L
Mole fraction of nitrogen = (16/10 × 22.4L) ÷ (16/10 ×22.4L+ 3/10x22.4l + 1/10X22.4L) = 4/5
Partial pressure of nitrogen at 1 atm = 4/5 * 1
=4/5
Hence, partial pressure of nitrogen in gas 1 and gas 2 are equal.
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If a gas that has a pressure of 15 atm, a volume of 28 liters, and a
temperature of 400 K, has an increased pressure to 18 atm and increase
the temperature to 500 K, what is the new volume of the gas?
о 8,571 L
о 29.17 L
525 L
18.9 L
*
2 points
To calculate the new volume of a gas, we must first understand the atm.
What is atm?
oceanic atmospheric pressure At sea level, it has a mean value of about and is defined as the pressure created by the weight of the atmosphere. Sometimes, this figure is used as a standard pressure or a reference pressure. The unit of pressure is atm.
What does one atmosphere of pressure equal?
760 cm of mercury is equal to one atmosphere of pressure at sea level.
Using the atm formula,
P1 V1/T1 = P2 V2/T2
15×28/500= 18×V2/500
15×28×400/500×18 = V2
V2=29.166
V2=29.17 L
Therefore the option (B) is correct.
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If we use 25.05 mL of the solution above to reach the endpoint titrating 10.00 mL of a 0.200 M HCl solution, what is the working (actual) concentration of the NaOH solution? Remember, you need a balanced chemical reaction for stoichiometry. (do not forget about SF)
The concentration of the solution is obtained as 0.08 M.
What is the concentration of sodium hydroxide?We know that the reaction that occurs between the sodium hydroxide and the hydrochloric acid is one that may be referred to as neutralization reaction. We can see that the reaction is given by; [tex]NaOH(aq) + HCl(aq) --- > NaCl(aq) +H_{2} O(l)[/tex]
Thus;
Concentration of the acid CA = 0.200 M
Volume of the acid VA = 10.00 mL
Volume of the base VB = 25.05 mL
Concentration of the base CB = ??
Number of moles of the acid NA = 1
Number of moles of the base NB = 1
Then;
CAVA/CBVB = NA/NB
CAVANB = CBVBNA
CB= CAVANB/VBNA
CB = 0.200 M * 10.00 mL * 1/ 25.05 mL * 1
= 0.08 M
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Welding is an industrial process that is used to join pieces of metal. a certain mixture of gases used in welding is composed of carbon dioxide and argon. the partial pressure of carbon dioxide is
0.080 atm and the partial pressure of argon is 0.24 atm.
(a): What is the total pressure of the mixture?
(b): what fraction of the molecules in the mixture are argon?
7. If you were to draw a particulate representation of air that contained 10 particles, how many of the particles you drew would be nitrogen? how many would be oxygen? argon? carbon dioxide? explain your reasoning
The total pressure of the system is 0.32 atm an the mole fraction argon of the carbon dioxide is 0.75.
What is the partial pressure?We know that where we have a mixture of gases, each of the gases would exert pressure on the walls of the container. The pressure that is exerted on the walls of the container is what we call the pressure of the gas.
We have;
Pressure of carbon dioxide = 0.080 atm
Pressure of argon = 0.24 atm
Total pressure of the system = 0.080 atm + 0.24 atm = 0.32 atm
Partial pressure = mole fraction * total pressure
Let the mole fraction be X
0.24 = X * 0.32 atm
X = 0.24 atm/0.32 atm
X =0.75
If I am to draw the number of particles, I would draw one particle for carbon dioxide and three particles for argon based on the value of the mole fraction of the system.
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A 2.00 gram sample of a glazed donut was placed in a bomb calorimeter with a heat capacity of 3.54 kcal/°C. The sample was completely burned, causing the temperature of the calorimeter to rise by 2.02 °C. How many kilocalories of energy were stored in the donut sample?
A 2.00 gram sample of a glazed donut was placed in a bomb calorimeter with a heat capacity of 3.54 kcal/°C. The sample was completely burned, causing the temperature of the calorimeter to rise by 2.02 °C. kilocalories of energy were stored in the sample is 14.30 kcal.
given that :
mass = 2 g
heat capacity = 3.54 kcal / °C
change in temperature = 2.02 °C
The heat energy expression is given as :
Q = mc ΔT
Q = 2 g × 3.54 kcal / °C × 2.02 °C
Q = 14.30 kcal
Thus, A 2.00 gram sample of a glazed donut was placed in a bomb calorimeter with a heat capacity of 3.54 kcal/°C. The sample was completely burned, causing the temperature of the calorimeter to rise by 2.02 °C. kilocalories of energy were stored in the sample is 14.30 kcal.
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Aluminum can be made by reducing alumina Al2O3 by carbon in the reaction equation
2 Al2O3 + 3 C → 4 Al + 3 CO2
according to. How much carbon is needed to reduce Al2O3 to produce 491 grams of pure aluminum? To give an answer to the gram, be sure to add the unit g after the numerical value of your answer.
Taking into account the reaction stoichiometry, 163.67 grams of C is needed to reduce Al₂O₃ to produce 491 grams of pure aluminum.
Reaction stoichiometryIn first place, the balanced reaction is:
2 Al₂O₃ + 3 C → 4 Al + 3 CO₂
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:
Al₂O₃: 2 molesC: 3 molesAl: 4 molesCO₂: 3 molesThe molar mass of the compounds is:
Al₂O₃: 102 g/moleC: 12 g/moleAl: 27 g/moleCO₂: 44 g/moleThen, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:
Al₂O₃: 2 moles ×102 g/mole= 204 gramsC: 3 moles ×12 g/mole= 36 gramsAl: 4 moles×27 g/mole= 108 gramsCO₂: 3 moles×44 g/mole= 132 gramsMass of carbon requiredThe following rule of three can be applied: if 108 grams of Al are produced by 36 grams of C, 491 grams of Al are produced by how much mass of C?
mass of C= (491 grams of Al× 36 grams of C)÷ 108 grams of Al
mass of C= 163.67 grams
Finally, 163.67 grams of C is required.
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A quantity of nitrogen gas is enclosed in a tightly stoppered 500 mL flask at room temperature (20.0 °C) and 0.836 atm pressure. The flask is then heated to 680 °C. If the flask can withstand pressures up to 3 atm, will it explode under this heating?
The vessel will not explode since the new gas pressure is less than 3 atm.
What will be the pressure when the temperature of a given volume of nitrogen gas is heated?The pressure when the temperature of a given volume of nitrogen gas is heated is calculated using the formula given below:
P₁/T₁ = P₂/T₂where;
P₁ = initial pressureT₁ = initial temperatureP₂= final pressureT₂ = final temperatureSolving for P₂
P₂ = P₁ * T₂ / T₁
P₂ = 0.836 * (680 + 273) / (20 + 273)
P₂ = 2.72 atm
The new pressure is less than 3 atm.
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How many protons and electrons are present in one Br -ion2
Answer:
Br- has 35 protons and 36 electrons
Explanation:
Do you mean Br-?
Br has atomic number of 35 => 35 protons.
Neutral Br has 35 electrons.
Br- has 1 extra electron, resulting in total of 36 electrons.