Question 1

Match the following.
-Avogadro's Law

Accepted Answer

A)  PV = nRT
B)  V1/n1 = V2/n2
C)  PT = PA + PB + PC ...
D)  P1V1 = P2V2
E)  V1/T1 = V2/T2

Question 2

The action of some commercial drain cleaners is based on the following reaction:
2 NaOH(s) + 2 Al(s) + 6 H2O(l) → 2 NaAl(OH) 4(s) + 3 H2(g) 
What is the volume of H2 gas formed at STP when 6.32 g of Al reacts with excess NaOH?

Accepted Answer

A)  3.50 L
B)  5.25 L
C)  7.87 L
D)  8.59 L

Question 3

The density of nitric oxide (NO) gas at 1.21 atm and 54.1°C is ________ g/L.

Accepted Answer

A)  0.0451
B)  0.740
C)  1.35
D)  0.273
E)  8.2

Question 4

Match the following.
-Charles's Law

Accepted Answer

A)  PV = nRT
B)  V1/n1 = V2/n2
C)  PT = PA + PB + PC ...
D)  P1V1 = P2V2
E)  V1/T1 = V2/T2

Question 5

Match the following.
-Ideal Gas Law

Accepted Answer

A)  PV = nRT
B)  V1/n1 = V2/n2
C)  PT = PA + PB + PC ...
D)  P1V1 = P2V2
E)  V1/T1 = V2/T2

Question 6

Match the following.
-Boyle's Law

Accepted Answer

A)  PV = nRT
B)  V1/n1 = V2/n2
C)  PT = PA + PB + PC ...
D)  P1V1 = P2V2
E)  V1/T1 = V2/T2

Question 7

The reason why a hot air balloon goes up in the air is that

Accepted Answer

A)  the number of air molecules inside the balloon increases.
B)  the pressure inside the balloon increases.
C)  the hot air inside the balloon is less dense.
D)  All of the above

Question 8

If NO and NH3 are allowed to effuse through a porous membrane under identical conditions,the rate of effusion for NH3 will be ________ times that of NO.

Accepted Answer

A)  0.57
B)  0.75
C)  1.3
D)  1.8

Question 9

The concentration of ozone in a sample of air that has a partial pressure of O3 of 0.33 torr and a total pressure of air of 735 torr is ________ ppm.

Accepted Answer

A)  4.5 × 102
B)  0.45
C)  0.045
D)  2.2 × 10-3
E)  2.2

Question 10

When 14.0 g of zinc metal reacts with excess HCl,how many liters of H2 gas are produced at STP?

Accepted Answer

A)  0.208 L
B)  0.416 L
C)  4.80 L
D)  9.60 L C

Question 11

The density of chlorine gas at 1.21 atm and 34.9°C is ________ g/L.

Accepted Answer

A)  0.0479
B)  0.295
C)  0.423
D)  1.70
E)  3.39

Question 12

Rank the following in order of decreasing rate of effusion.
F2 SF6 CO Kr

Accepted Answer

A)  SF6 > Kr > F2 > CO
B)  Kr > CO > SF6 > F2
C)  F2 > Kr > CO > SF6
D)  CO > F2 > Kr > SF6
E)  CO > F2 > SF6 > Kr

Question 13

Place the following gases in order of increasing density at STP.
N2 NH3 N2O4 Ar

Accepted Answer

A)  N2O4 2 3
B)  Ar 2O4 2 3
C)  N2 2O4 3
D)  NH3 2 2O4
E)  Ar 2 3 2O4 D

Question 14

A mixture of 10.0 g of Ne and 10.0 g Ar has a total pressure of 1.6 atm.What is the partial pressure of Ne?

Accepted Answer

A)  1.1 atm
B)  0.80 atm
C)  0.54 atm
D)  0.40 atm
E)  1.3 atm

Question 15

The density of a gas is 1.43 g/mole at STP.What is the gas?

Accepted Answer

A)  Cl2
B)  S
C)  O2
D)  Ne

Question 16

The volume of a gas is proportional to the temperature of a gas is known as

Accepted Answer

A)  Avogadro's Law.
B)  Ideal Gas Law.
C)  Charles's Law.
D)  Boyle's Law.

Question 17

The mole fraction of carbon dioxide in dry air near sea level is 0.000375,where the molar mass of carbon dioxide is 44.010.The partial pressure of carbon dioxide when the total atmospheric pressure (dry air) is 97.5 kPa is ________ kPa.

Accepted Answer

A)  2.63 × 10 5
B)  5.97 × 103
C)  0.0370
D)  1.63
E)  8.40 × 10-4

Question 18

A gas occupies 22.4 L at STP and 19.0 L at 100°C and 1.50 atm pressure.How many moles of gas did the system gain or lose?

Accepted Answer

A)  0.08 moles gained
B)  0.01 moles gained
C)  0.01 moles lost
D)  0.07 moles lost

Question 19

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

Accepted Answer

A)  0.600 moles
B)  1.50 moles
C)  0.33 moles
D)  6.00 moles A

Question 20

A mixture of He,Ne and Ar has a pressure of 7.85 atm.If the Ne has a mole fraction of 0.47 and Ar has a mole fraction of 0.23,what is the pressure of He?

Accepted Answer

A)  4.2 atm
B)  3.7 atm
C)  1.8 atm
D)  5.5 atm
E)  2.4 atm

Exam 5: Gases

Match the following. -Avogadro's Law

Correct AnswerverifiedShow Answer

The action of some commercial drain cleaners is based on the following reaction: 2 NaOH(s) + 2 Al(s) + 6 H2O(l) → 2 NaAl(OH) 4(s) + 3 H2(g) What is the volume of H2 gas formed at STP when 6.32 g of Al reacts with excess NaOH?

Correct AnswerverifiedShow Answer

The density of nitric oxide (NO) gas at 1.21 atm and 54.1°C is ________ g/L.

Correct AnswerverifiedShow Answer

Match the following. -Charles's Law

Correct AnswerverifiedShow Answer

Match the following. -Ideal Gas Law

Correct AnswerverifiedShow Answer

Match the following. -Boyle's Law

Correct AnswerverifiedShow Answer

The reason why a hot air balloon goes up in the air is that

Correct AnswerverifiedShow Answer

If NO and NH3 are allowed to effuse through a porous membrane under identical conditions,the rate of effusion for NH3 will be ________ times that of NO.

Correct AnswerverifiedShow Answer

The concentration of ozone in a sample of air that has a partial pressure of O3 of 0.33 torr and a total pressure of air of 735 torr is ________ ppm.

Correct AnswerverifiedShow Answer

When 14.0 g of zinc metal reacts with excess HCl,how many liters of H2 gas are produced at STP?

Correct AnswerverifiedC

The density of chlorine gas at 1.21 atm and 34.9°C is ________ g/L.

Correct AnswerverifiedShow Answer

Rank the following in order of decreasing rate of effusion. F2 SF6 CO Kr

Correct AnswerverifiedShow Answer

Place the following gases in order of increasing density at STP. N2 NH3 N2O4 Ar

Correct AnswerverifiedD

A mixture of 10.0 g of Ne and 10.0 g Ar has a total pressure of 1.6 atm.What is the partial pressure of Ne?

Correct AnswerverifiedShow Answer

The density of a gas is 1.43 g/mole at STP.What is the gas?

Correct AnswerverifiedShow Answer

The volume of a gas is proportional to the temperature of a gas is known as

Correct AnswerverifiedShow Answer

The mole fraction of carbon dioxide in dry air near sea level is 0.000375,where the molar mass of carbon dioxide is 44.010.The partial pressure of carbon dioxide when the total atmospheric pressure (dry air) is 97.5 kPa is ________ kPa.

Correct AnswerverifiedShow Answer

A gas occupies 22.4 L at STP and 19.0 L at 100°C and 1.50 atm pressure.How many moles of gas did the system gain or lose?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedA

A mixture of He,Ne and Ar has a pressure of 7.85 atm.If the Ne has a mole fraction of 0.47 and Ar has a mole fraction of 0.23,what is the pressure of He?

Correct AnswerverifiedShow Answer

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The action of some commercial drain cleaners is based on the following reaction: 2 NaOH(s) + 2 Al(s) + 6 H₂O(l) → 2 NaAl(OH) ₄(s) + 3 H₂(g) What is the volume of H₂ gas formed at STP when 6.32 g of Al reacts with excess NaOH?

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If NOand NH₃ are allowed to effuse through a porous membrane under identical conditions,the rate of effusion for NH₃ will be ________ times that of NO.

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The concentration of ozone in a sample of air that has a partial pressure of O₃ of 0.33 torr and a total pressure of air of 735 torr is ________ ppm.

Correct Answer
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When 14.0 g of zinc metal reacts with excess HCl,how many liters of H₂ gas are produced at STP?

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C

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Rank the following in order of decreasing rate of effusion. F₂ SF₆ CO Kr

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Place the following gases in order of increasing density at STP. N₂ NH₃ N₂O₄ Ar

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D

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A

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