Question 1

If NO2 and NH3 are allowed to effuse through a porous membrane under identical conditions,the rate of effusion for NH3 will be ________ times that of NO2.

Accepted Answer

A)  0.37
B)  0.61
C)  1.6
D)  2.7E) B) and C)
F) A) and C)

Question 2

A sample of 0.300 moles of nitrogen occupies 0.600 L.Under the same conditions,what number of moles occupies 1.200 L?

Accepted Answer

A)  0.600 moles
B)  1.50 moles
C)  0.33 moles
D)  6.00 molesE) B) and C)
F) A) and D)

Question 3

You have three cylinders containing O2 gas at the same volume and pressure.Cylinder A is at -15 °C,cylinder B is at -5 °F,cylinder C is at 255 K.Which cylinder contains the largest mass of oxygen?

Accepted Answer

A)  cylinder A
B)  cylinder B
C)  cylinder C
D)  All cylinders contain the same mass of O2.E) B) and C)
F) None of the above

Question 4

Explain what the term "mean free path" describes.How does it change with decreasing pressure?

Accepted Answer

Mean free path describes the distance th...

Question 5

Which of the following would have a density of 1.37 g L-1 at 7.0 °C and 0.9967 bar?

Accepted Answer

A)  N2
B)  O2
C)  Kr 
D)  Rn E) All of the above
F) None of the above

Question 6

How many molecules of N2 are in a 400.0 mL container at 1.0399 bar and 135 °C?

Accepted Answer

A)  7.01 × 1021 molecules
B)  7.38 × 1021 molecules
C)  2.12 × 1022 molecules
D)  2.23 × 1022 moleculesE) B) and C)
F) A) and C)

Question 7

Using the graph below,determine the gas that has the lowest density at STP.

Accepted Answer

A)  A
B)  B
C)  C
D)  D
E)  All of the gases have the same density at STP.F) All of the above
G) A) and C)

Question 8

Calculate the temperature,in K,of 2.20 moles of gas occupying 3.50 L at 3.30 bar.

Accepted Answer

A)  63.1 K
B)  5.25 K
C)  337 K
D)  28.0 KE) A) and B)
F) B) and C)

Question 9

Determine the volume of SO2 (at STP) formed from the reaction of 96.7 g of FeS2 and 55.0 L of O2 (at 398 K and 1.20 bar) .The molar mass of FeS2 is 119.99 g mol-1. 4FeS2(s) + 11O2(g) → 2Fe2O3(s) + 8SO2(g)

Accepted Answer

A)  36.1 L
B)  45.3 L
C)  18.1 L
D)  27.6 L
E)  32.5 LF) A) and B)
G) A) and C)

Question 10

When 14.0 g of zinc metal reacts with excess HCl,how many litres of H2 gas are produced at STP?  Zn(s) +2HCl(aq) →ZnCl2(aq) +H2(g) \mathrm { Zn } ( s )  + 2 \mathrm { HCl } ( a q )  \rightarrow \mathrm { ZnCl } _ { 2 } ( a q )  + \mathrm { H } _ { 2 } ( g ) Zn(s) +2HCl(aq) →ZnCl2​(aq) +H2​(g)

Accepted Answer

A)  0.208 L
B)  0.416 L
C)  4.86 L
D)  9.60 L E) A) and D)
F) B) and C)

Question 11

What volume will 4.91 × 1022 atoms of Ne occupy at STP?

Accepted Answer

A)  1.10 L
B)  2.00 L
C)  2.24 L
D)  3.11 L
E)  1.85 LF) A) and E)
G) C) and D)

Question 12

Identify the gas particle that travels the fastest.

Accepted Answer

A)  H2
B)  O2
C)  Ne
D)  N2
E)  COF) C) and D)
G) B) and D)

Question 13

How many litres of oxygen are needed to exactly react with 19.8 g of methane at STP? CH4(g) + 2O2(g) → CO2(g) + 2H2O(l)

Accepted Answer

A)  13.9 L
B)  27.8 L
C)  56.0 L
D)  60.5 LE) B) and C)
F) All of the above

Question 14

What mass of NO2 is contained in a 13.0 L tank at 4.58 bar and 385 K?

Accepted Answer

A)  18.8 g
B)  53.1 g
C)  24.4 g
D)  85.6 g
E)  69.2 gF) A) and B)
G) D) and E)

Question 15

A 0.334 g sample of an unknown halogen occupies 109 mL at 398 K and 1.43 bar.What is the identity of the halogen?

Accepted Answer

A)  Br2
B)  F2
C)  Cl2
D)  I2
E)  At2F) A) and E)
G) C) and E)

Question 16

A fixed amount of gas at 25.0 °C occupies a volume of 20.0 L when the pressure is 0.8386 bar.Use Charles's law to calculate the volume (L) the gas will occupy when the temperature is increased to  131∘C131 ^ { \circ } \mathrm { C }131∘C  while maintaining the pressure at 0.8386 bar.

Accepted Answer

A)  14.8 L
B)  105 L
C)  3.82 L
D)  22.4 L
E)  27.1 L F) B) and E)
G) A) and E)

Question 17

How many molecules of CO2 are contained in a 10.0 L tank at 7.53 bar and 485 K?

Accepted Answer

A)  1.89 × 1024 molecules
B)  1.12 × 1024 molecules
C)  8.32 × 1024 molecules
D)  4.89 × 1024 molecules
E)  3.63 × 1024 moleculesF) A) and E)
G) C) and D)

Question 18

Which of the following statements is TRUE?

Accepted Answer

A)  At a given temperature,lighter gas particles travel more slowly than heavier gas particles.
B)  The smaller a gas particle,the slower it will effuse.
C)  The higher the temperature,the lower the average kinetic energy of the sample.
D)  At low temperatures,intermolecular forces become important and the pressure of a gas will be lower than predicted by the ideal gas law.E) A) and B)
F) C) and D)

Question 19

Define pressure.

Accepted Answer

Pressure is the force exerted ...

Question 20

An unknown gas has a root mean square velocity of 332 m s-1 at 313 K.Identify the unknown gas.

Accepted Answer

A)  Kr
B)  O2
C)  Ar
D)  F2
E)  Cl2F) A) and E)
G) None of the above

Exam 5: Gases

A fixed amount of gas at 25.0 °C occupies a volume of 20.0 L when the pressure is 0.8386 bar.Use Charles's law to calculate the volume (L) the gas will occupy when the temperature is increased to 131∘C131 ^ { \circ } \mathrm { C }131∘C while maintaining the pressure at 0.8386 bar.

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A 0.334 g sample of an unknown halogen occupies 109 mL at 398 K and 1.43 bar.What is the identity of the halogen?

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Using the graph below,determine the gas that has the lowest density at STP.

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If NO2 and NH3 are allowed to effuse through a porous membrane under identical conditions,the rate of effusion for NH3 will be ________ times that of NO2.

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Calculate the temperature,in K,of 2.20 moles of gas occupying 3.50 L at 3.30 bar.

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Which of the following statements is TRUE?

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A sample of 0.300 moles of nitrogen occupies 0.600 L.Under the same conditions,what number of moles occupies 1.200 L?

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How many molecules of CO2 are contained in a 10.0 L tank at 7.53 bar and 485 K?

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How many molecules of N2 are in a 400.0 mL container at 1.0399 bar and 135 °C?

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Determine the volume of SO2 (at STP) formed from the reaction of 96.7 g of FeS2 and 55.0 L of O2 (at 398 K and 1.20 bar) .The molar mass of FeS2 is 119.99 g mol-1. 4FeS2(s) + 11O2(g) → 2Fe2O3(s) + 8SO2(g)

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What volume will 4.91 × 1022 atoms of Ne occupy at STP?

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Define pressure.

Correct AnswerverifiedPressure is the force exerted ...View AnswerShow Answer

Which of the following would have a density of 1.37 g L-1 at 7.0 °C and 0.9967 bar?

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Identify the gas particle that travels the fastest.

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How many litres of oxygen are needed to exactly react with 19.8 g of methane at STP? CH4(g) + 2O2(g) → CO2(g) + 2H2O(l)

Correct AnswerverifiedShow Answer

Explain what the term "mean free path" describes.How does it change with decreasing pressure?

Correct AnswerverifiedMean free path describes the distance th...View AnswerShow Answer

You have three cylinders containing O2 gas at the same volume and pressure.Cylinder A is at -15 °C,cylinder B is at -5 °F,cylinder C is at 255 K.Which cylinder contains the largest mass of oxygen?

Correct AnswerverifiedShow Answer

An unknown gas has a root mean square velocity of 332 m s-1 at 313 K.Identify the unknown gas.

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What mass of NO2 is contained in a 13.0 L tank at 4.58 bar and 385 K?

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When 14.0 g of zinc metal reacts with excess HCl,how many litres of H2 gas are produced at STP? Zn(s) +2HCl(aq) →ZnCl2(aq) +H2(g) \mathrm { Zn } ( s ) + 2 \mathrm { HCl } ( a q ) \rightarrow \mathrm { ZnCl } _ { 2 } ( a q ) + \mathrm { H } _ { 2 } ( g ) Zn(s) +2HCl(aq) →ZnCl2​(aq) +H2​(g)

Correct AnswerverifiedShow Answer

A fixed amount of gas at 25.0 °C occupies a volume of 20.0 L when the pressure is 0.8386 bar.Use Charles's law to calculate the volume (L) the gas will occupy when the temperature is increased to $131 ^ { \circ } \mathrm { C }$ while maintaining the pressure at 0.8386 bar.

Correct Answer
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Correct Answer
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Correct Answer
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If NO₂ and NH₃ are allowed to effuse through a porous membrane under identical conditions,the rate of effusion for NH₃ will be ________ times that of NO₂.

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Correct Answer
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Correct Answer
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Correct Answer
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How many molecules of CO₂ are contained in a 10.0 L tank at 7.53 bar and 485 K?

Correct Answer
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How many molecules of N₂ are in a 400.0 mL container at 1.0399 bar and 135 °C?

Correct Answer
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Determine the volume of SO₂ (at STP) formed from the reaction of 96.7 g of FeS₂ and 55.0 L of O₂ (at 398 K and 1.20 bar) .The molar mass of FeS₂ is 119.99 g mol^-1. 4FeS₂(s) + 11O₂(g) → 2Fe₂O₃(s) + 8SO₂(g)

Correct Answer
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What volume will 4.91 × 10²²atoms of Ne occupy at STP?

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Correct Answer
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Pressure is the force exerted ...
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Which of the following would have a density of 1.37 g L^-1 at 7.0 °C and 0.9967 bar?

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Correct Answer
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How many litres of oxygen are needed to exactly react with 19.8 g of methane at STP? CH₄(g) + 2O₂(g) → CO₂(g) + 2H₂O(l)

Correct Answer
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Correct Answer
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Mean free path describes the distance th...
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You have three cylinders containing O₂ gas at the same volume and pressure.Cylinder A is at -15 °C,cylinder B is at -5 °F,cylinder C is at 255 K.Which cylinder contains the largest mass of oxygen?

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An unknown gas has a root mean square velocity of 332 m s^-1 at 313 K.Identify the unknown gas.

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What mass of NO₂ is contained in a 13.0 L tank at 4.58 bar and 385 K?

Correct Answer
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When 14.0 g of zinc metal reacts with excess HCl,how many litres of H₂ gas are produced at STP? $\mathrm { Zn } ( s ) + 2 \mathrm { HCl } ( a q ) \rightarrow \mathrm { ZnCl } _ { 2 } ( a q ) + \mathrm { H } _ { 2 } ( g )$

Correct Answer
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