Question 1

Arrange the following gases in order of increasing average molecular speed at 25°C. Cl2, O2, F2, N2

Accepted Answer

A)  Cl2 2 2 2
B)  Cl2 2 2 2
C)  N2 2 2 2
D)  Cl2 2 2 2
E)  F2 2 2 2

Question 2

A sample of He gas (2.0 mmol) effused through a pinhole in 53 s. The same amount of an unknown gas, under the same conditions, effused through the pinhole in 248 s. The molecular mass of the unknown gas is __________ g/mol.

Accepted Answer

A)  0.19
B)  5.5
C)  88
D)  19
E)  350

Question 3

A gas at a pressure of 325 torr exerts a force of __________ N on an area of 5.5 m2.

Accepted Answer

A)  1.8 × 103
B)  59
C)  2.4 × 105
D)  0.018
E)  2.4

Question 4

Calcium hydride (CaH2) reacts with water to form hydrogen gas: CaH2 (s) + 2H2O (l) → Ca(OH) 2 (aq) + 2H2 (g) 
How many grams of CaH2 are needed to generate 48.0 L of H2 gas at a pressure of 0.888 atm and a temperature of 32°C?

Accepted Answer

A)  50.7
B)  0.851
C)  143
D)  35.8
E)  71.7

Question 5

The reaction of 25 mL of N2 gas with 75 mL of H2 gas to form ammonia via the equation: N2 (g) + 3H2 (g) → 2NH3 (g) 
Will produce __________ mL of ammonia if pressure and temperature are kept constant.

Accepted Answer

A)  250
B)  50
C)  200
D)  150
E)  100

Question 6

Given the equation:
C2H6 (g) + O2 (g)→ CO2 (g)+ H2O (g)(not balanced)
Determine the number of liters of CO2 formed at STP. when 240.0 grams of C2H6 is burned in excess oxygen gas.

Accepted Answer

Question 7

The amount of gas that occupies 36.52 L at 68.0°C and 672 mm Hg is __________ mol.

Accepted Answer

A)  127
B)  1.15
C)  878
D)  24.4
E)  12.7

Question 8

The density of chlorine (Cl2) gas at 25°C and 60. kPa is __________ g/L.

Accepted Answer

A)  20
B)  4.9
C)  1.7
D)  0.86
E)  0.58

Question 9

A flask contains a mixture of He and Ne at a total pressure of 2.6 atm. There are 2.0 mol of He and 5.0 mol of Ne in the flask. The partial pressure of He is __________ atm.

Accepted Answer

A)  9.1
B)  6.5
C)  1.04
D)  0.74
E)  1.86

Question 10

The root-mean-square speed of CO at 113°C is __________ m/s.

Accepted Answer

A)  317
B)  58.3
C)  586
D)  993
E)  31.5

Question 11

A sample of gas (1.9 mol) is in a flask at 21°C and 697 mm Hg. The flask is opened and more gas is added to the flask. The new pressure is 782 mm Hg and the temperature is now 26°C. There are now __________ mol of gas in the flask.

Accepted Answer

A)  1.6
B)  2.1
C)  2.9
D)  3.5
E)  0.28

Question 12

A sample of an unknown volatile liquid was injected into a Dumas flask (mflask = 27.0928 g, Vflask = 0.1040 L) and heated until no visible traces of the liquid could be found. The flask and its contents were then rapidly cooled and reweighed (mflask+vapor = 27.4593 g) . The atmospheric pressure and temperature during the experiment were 0.976 atm and 18.0 °C, respectively. The unknown volatile liquid was __________.

Accepted Answer

A)  C6H12
B)  C6H14
C)  C7H14
D)  C7H16
E)  C6H6

Question 13

The rms speed of methane molecules at 45.0°C is __________ m/sec.

Accepted Answer

The answer of The rms speed of methane molecules at...

Question 14

The volume occupied by 0.50 mol of gas at 35°C and 2.0 atm pressure is __________ L.

Accepted Answer

A)  38
B)  6.3
C)  .72
D)  .053
E)  .026

Question 15

The main component of air is oxygen.

Accepted Answer

A) True 
 B)False

Question 16

The density (in g/L) of CO2 at 1140 torr and 60.0°C is __________.

Accepted Answer

A)  2.42
B)  16.2
C)  5.70
D)  44.0
E)  10.9

Question 17

CO (5.00 g) and CO2 (5.00 g) were placed in a 750.0 mL container at 50.0°C. The partial pressure of CO in the container was __________ atm.

Accepted Answer

A)  6.29
B)  4.02
C)  10.3
D)  0.292
E)  1.60

Question 18

The volume of fluorine gas required to react with 2.67 g of calcium bromide to form calcium fluoride and bromine at 41.0°C and 4.31 atm is __________ mL.

Accepted Answer

A)  10.4
B)  210
C)  420
D)  79.9
E)  104

Question 19

In a gas mixture of He, Ne, and Ar with a total pressure of 8.40 atm, the mole fraction of Ar is __________ if the partial pressures of He and Ne are 1.50 and 2.00 atm, respectively.

Accepted Answer

A)  0.179
B)  0.238
C)  0.357
D)  0.583
E)  0.417

Question 20

How much faster does 235UF6 effuse than 238UF6?

Accepted Answer

A)  1.013 times as fast
B)  1.009 times as fast
C)  1.004 times as fast
D)  1.006 times as fast
E)  1.018 times as fast

Exam 10: Gases

The main component of air is oxygen.

Correct Answer
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The volume occupied by 0.50 mol of gas at 35°C and 2.0 atm pressure is __________ L.

Correct Answer
verified

Arrange the following gases in order of increasing average molecular speed at 25°C. Cl₂, O₂, F₂, N₂

Correct Answer
verified

A sample of He gas (2.0 mmol) effused through a pinhole in 53 s. The same amount of an unknown gas, under the same conditions, effused through the pinhole in 248 s. The molecular mass of the unknown gas is __________ g/mol.

Correct Answer
verified

The rms speed of methane molecules at 45.0°C is __________ m/sec.

Correct Answer
verified

A flask contains a mixture of He and Ne at a total pressure of 2.6 atm. There are 2.0 mol of He and 5.0 mol of Ne in the flask. The partial pressure of He is __________ atm.

Correct Answer
verified

A gas at a pressure of 325 torr exerts a force of __________ N on an area of 5.5 m².

Correct Answer
verified

How much faster does 235UF₆ effuse than 238UF₆?

Correct Answer
verified

The volume of fluorine gas required to react with 2.67 g of calcium bromide to form calcium fluoride and bromine at 41.0°C and 4.31 atm is __________ mL.

Correct Answer
verified

The density (in g/L) of CO₂ at 1140 torr and 60.0°C is __________.

Correct Answer
verified

CO (5.00 g) and CO₂ (5.00 g) were placed in a 750.0 mL container at 50.0°C. The partial pressure of CO in the container was __________ atm.

Correct Answer
verified

Correct Answer
verified

The reaction of 25 mL of N₂ gas with 75 mL of H₂ gas to form ammonia via the equation: N₂ (g) + 3H₂ (g) → 2NH₃ (g) Will produce __________ mL of ammonia if pressure and temperature are kept constant.

Correct Answer
verified

The density of chlorine (Cl₂) gas at 25°C and 60. kPa is __________ g/L.

Correct Answer
verified

Given the equation: C₂H₆(g₎ + O₂ (g)→ CO₂ (g)+ H₂O (g)(not balanced) Determine the number of liters of CO₂ formed at STP. when 240.0 grams of C₂H₆ is burned in excess oxygen gas.

Correct Answer
verified

A sample of gas (1.9 mol) is in a flask at 21°C and 697 mm Hg. The flask is opened and more gas is added to the flask. The new pressure is 782 mm Hg and the temperature is now 26°C. There are now __________ mol of gas in the flask.

Correct Answer
verified

Calcium hydride (CaH₂) reacts with water to form hydrogen gas: CaH₂ (s) + 2H₂O (l) → Ca(OH) ₂ (aq) + 2H₂ (g) How many grams of CaH₂ are needed to generate 48.0 L of H₂ gas at a pressure of 0.888 atm and a temperature of 32°C?

Correct Answer
verified

In a gas mixture of He, Ne, and Ar with a total pressure of 8.40 atm, the mole fraction of Ar is __________ if the partial pressures of He and Ne are 1.50 and 2.00 atm, respectively.

Correct Answer
verified

The root-mean-square speed of CO at 113°C is __________ m/s.

Correct Answer
verified

The amount of gas that occupies 36.52 L at 68.0°C and 672 mm Hg is __________ mol.

Correct Answer
verified

Exam 10: Gases

The main component of air is oxygen.

Correct AnswerverifiedShow Answer

The volume occupied by 0.50 mol of gas at 35°C and 2.0 atm pressure is __________ L.

Correct AnswerverifiedShow Answer

Arrange the following gases in order of increasing average molecular speed at 25°C. Cl2, O2, F2, N2

Correct AnswerverifiedShow Answer

A sample of He gas (2.0 mmol) effused through a pinhole in 53 s. The same amount of an unknown gas, under the same conditions, effused through the pinhole in 248 s. The molecular mass of the unknown gas is __________ g/mol.

Correct AnswerverifiedShow Answer

The rms speed of methane molecules at 45.0°C is __________ m/sec.

Correct AnswerverifiedShow Answer

A flask contains a mixture of He and Ne at a total pressure of 2.6 atm. There are 2.0 mol of He and 5.0 mol of Ne in the flask. The partial pressure of He is __________ atm.

Correct AnswerverifiedShow Answer

A gas at a pressure of 325 torr exerts a force of __________ N on an area of 5.5 m2.

Correct AnswerverifiedShow Answer

How much faster does 235UF6 effuse than 238UF6?

Correct AnswerverifiedShow Answer

The volume of fluorine gas required to react with 2.67 g of calcium bromide to form calcium fluoride and bromine at 41.0°C and 4.31 atm is __________ mL.

Correct AnswerverifiedShow Answer

The density (in g/L) of CO2 at 1140 torr and 60.0°C is __________.

Correct AnswerverifiedShow Answer

CO (5.00 g) and CO2 (5.00 g) were placed in a 750.0 mL container at 50.0°C. The partial pressure of CO in the container was __________ atm.

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

The reaction of 25 mL of N2 gas with 75 mL of H2 gas to form ammonia via the equation: N2 (g) + 3H2 (g) → 2NH3 (g) Will produce __________ mL of ammonia if pressure and temperature are kept constant.

Correct AnswerverifiedShow Answer

The density of chlorine (Cl2) gas at 25°C and 60. kPa is __________ g/L.

Correct AnswerverifiedShow Answer

Given the equation: C2H6 (g) + O2 (g)→ CO2 (g)+ H2O (g)(not balanced) Determine the number of liters of CO2 formed at STP. when 240.0 grams of C2H6 is burned in excess oxygen gas.

Correct AnswerverifiedShow Answer

A sample of gas (1.9 mol) is in a flask at 21°C and 697 mm Hg. The flask is opened and more gas is added to the flask. The new pressure is 782 mm Hg and the temperature is now 26°C. There are now __________ mol of gas in the flask.

Correct AnswerverifiedShow Answer

Calcium hydride (CaH2) reacts with water to form hydrogen gas: CaH2 (s) + 2H2O (l) → Ca(OH) 2 (aq) + 2H2 (g) How many grams of CaH2 are needed to generate 48.0 L of H2 gas at a pressure of 0.888 atm and a temperature of 32°C?

Correct AnswerverifiedShow Answer

In a gas mixture of He, Ne, and Ar with a total pressure of 8.40 atm, the mole fraction of Ar is __________ if the partial pressures of He and Ne are 1.50 and 2.00 atm, respectively.

Correct AnswerverifiedShow Answer

The root-mean-square speed of CO at 113°C is __________ m/s.

Correct AnswerverifiedShow Answer

The amount of gas that occupies 36.52 L at 68.0°C and 672 mm Hg is __________ mol.

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Arrange the following gases in order of increasing average molecular speed at 25°C. Cl₂, O₂, F₂, N₂

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

A gas at a pressure of 325 torr exerts a force of __________ N on an area of 5.5 m².

Correct Answer
verified

How much faster does 235UF₆ effuse than 238UF₆?

Correct Answer
verified

Correct Answer
verified

The density (in g/L) of CO₂ at 1140 torr and 60.0°C is __________.

Correct Answer
verified

CO (5.00 g) and CO₂ (5.00 g) were placed in a 750.0 mL container at 50.0°C. The partial pressure of CO in the container was __________ atm.

Correct Answer
verified

Correct Answer
verified

The reaction of 25 mL of N₂ gas with 75 mL of H₂ gas to form ammonia via the equation: N₂ (g) + 3H₂ (g) → 2NH₃ (g) Will produce __________ mL of ammonia if pressure and temperature are kept constant.

Correct Answer
verified

The density of chlorine (Cl₂) gas at 25°C and 60. kPa is __________ g/L.

Correct Answer
verified

Given the equation: C₂H₆(g₎ + O₂ (g)→ CO₂ (g)+ H₂O (g)(not balanced) Determine the number of liters of CO₂ formed at STP. when 240.0 grams of C₂H₆ is burned in excess oxygen gas.

Correct Answer
verified

Correct Answer
verified

Calcium hydride (CaH₂) reacts with water to form hydrogen gas: CaH₂ (s) + 2H₂O (l) → Ca(OH) ₂ (aq) + 2H₂ (g) How many grams of CaH₂ are needed to generate 48.0 L of H₂ gas at a pressure of 0.888 atm and a temperature of 32°C?

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
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