Question 1

Which of the following gases will be the slowest to diffuse through a room?

Accepted Answer

A)  methane,CH4
B)  hydrogen sulfide,H2S
C)  carbon dioxide,CO2
D)  water,H2O
E)  neon,NeF) A) and E)
G) C) and E)

Question 2

An unknown liquid is vaporized in a 273-mL flask by immersion in a water bath at 99°C.The barometric pressure is 753 torr.If the mass of the substance's vapor retained in the flask is 1.362 g,what is its molar mass?

Accepted Answer

A)  20.4 g/mol
B)  40.9 g/mol
C)  112 g/mol
D)  154 g/mol
E)  184 g/molF) None of the above
G) B) and D)

Question 3

Ima Chemist found the density of Freon-11 (CFCl3) to be 5.58 g/L under her experimental conditions.Her measurements showed that the density of an unknown gas was 4.38 g/L under the same conditions.What is the molar mass of the unknown?

Accepted Answer

A)  96.7 g/mol
B)  108 g/mol
C)  127 g/mol
D)  165 g/mol
E)  175 g/molF) B) and C)
G) A) and C)

Question 4

A sample of methane gas,CH4(g) ,occupies a volume of 60.3 L at a pressure of 469 torr and a temperature of 29.3°C.What would be its temperature at a pressure of 243 torr and volume of 60.3 L?

Accepted Answer

A)  -116.5°C
B)  15.2°C
C)  15.5°C
D)  57.7°C
E)  310.6°CF) B) and E)
G) A) and D)

Question 5

State Avogadro's Law.

Accepted Answer

Equal volumes of gas...

Question 6

Magnesium metal (0.100 mol) and a volume of aqueous hydrochloric acid that contains 0.500 mol of HCl are combined and react to completion.How many liters of hydrogen gas,measured at STP,are produced?
Mg(s) + 2HCl(aq)   →	o→  MgCl2(aq) + H2(g)

Accepted Answer

A)  2.24 L of H2
B)  4.48 L of H2
C)  5.60 L of H2
D)  11.2 L of H2
E)  22.4 L of H2 F) A) and C)
G) C) and E)

Question 7

Hydrogen peroxide was catalytically decomposed and 75.3 mL of oxygen gas was collected over water at 25°C and 742 torr.What mass of oxygen was collected? (Pwater = 24 torr at 25°C)

Accepted Answer

A)  0.00291 g
B)  0.0931 g
C)  0.0962 g
D)  0.0993 g
E)  0.962 gF) A) and D)
G) A) and C)

Question 8

Starting from the Ideal Gas Equation,derive an equation corresponding to Charles' Law,stating all important assumptions or conditions.

Accepted Answer

Ideal Gas Equation is PV = nRT.Charles's...

Question 9

At a temperature of absolute zero,the volume of an ideal gas is zero.

Accepted Answer

A) True 
 B)False

Question 10

"The rate of effusion of a gas is inversely proportional to the square root of its molar mass" is a statement of _________________ Law.

Accepted Answer

A)  Charles'
B)  Graham's
C)  Dalton's
D)  Avogadro's
E)  Boyle'sF) A) and E)
G) All of the above

Question 11

At moderate pressures (~ 200 atm) ,the measured pressure exerted by CO2 gas is less than that predicted by the ideal gas equation.This is mainly because

Accepted Answer

A)  such high pressures cannot be accurately measured.
B)  CO2 will condense to a liquid at 200 atm pressure.
C)  gas phase collisions prevent CO2 molecules from colliding with the walls of the container.
D)  of attractive intermolecular forces between CO2 molecules.
E)  the volume occupied by the CO2 molecules themselves becomes significant.F) D) and E)
G) B) and C)

Question 12

Dry air is approximately 78% nitrogen,21% oxygen and 1% argon,by number of molecules.What is the partial pressure of oxygen in a sample of dry air,if atmospheric pressure is 751 torr?

Accepted Answer

The answer of Dry air is approximately 78% nitrogen,21% oxygen...

Question 13

A sample of carbon dioxide gas at 125°C and 248 torr occupies a volume of 275 L.What will the gas pressure be if the volume is increased to 321 L at 125°C?

Accepted Answer

A)  212 torr
B)  289 torr
C)  356 torr
D)  441 torr
E)  359 torrF) A) and C)
G) B) and C)

Exam 5: Gases and the Kinetic-Molecular Theory

Dry air is approximately 78% nitrogen,21% oxygen and 1% argon,by number of molecules.What is the partial pressure of oxygen in a sample of dry air,if atmospheric pressure is 751 torr?

Correct Answer
verified

Starting from the Ideal Gas Equation,derive an equation corresponding to Charles' Law,stating all important assumptions or conditions.

Correct Answer
verified
Ideal Gas Equation is PV = nRT.Charles's...
View Answer

An unknown liquid is vaporized in a 273-mL flask by immersion in a water bath at 99°C.The barometric pressure is 753 torr.If the mass of the substance's vapor retained in the flask is 1.362 g,what is its molar mass?

Correct Answer
verified

Which of the following gases will be the slowest to diffuse through a room?

Correct Answer
verified

"The rate of effusion of a gas is inversely proportional to the square root of its molar mass" is a statement of _________________ Law.

Correct Answer
verified

A sample of methane gas,CH₄(g) ,occupies a volume of 60.3 L at a pressure of 469 torr and a temperature of 29.3°C.What would be its temperature at a pressure of 243 torr and volume of 60.3 L?

Correct Answer
verified

Ima Chemist found the density of Freon-11 (CFCl₃) to be 5.58 g/L under her experimental conditions.Her measurements showed that the density of an unknown gas was 4.38 g/L under the same conditions.What is the molar mass of the unknown?

Correct Answer
verified

A sample of carbon dioxide gas at 125°C and 248 torr occupies a volume of 275 L.What will the gas pressure be if the volume is increased to 321 L at 125°C?

Correct Answer
verified

State Avogadro's Law.

Correct Answer
verified
Equal volumes of gas...
View Answer

At moderate pressures (~ 200 atm) ,the measured pressure exerted by CO₂ gas is less than that predicted by the ideal gas equation.This is mainly because

Correct Answer
verified

Magnesium metal (0.100 mol) and a volume of aqueous hydrochloric acid that contains 0.500 mol of HCl are combined and react to completion.How many liters of hydrogen gas,measured at STP,are produced? Mg(s) + 2HCl(aq) $\to$ MgCl₂(aq) + H₂(g)

Correct Answer
verified

Hydrogen peroxide was catalytically decomposed and 75.3 mL of oxygen gas was collected over water at 25°C and 742 torr.What mass of oxygen was collected? (P_water = 24 torr at 25°C)

Correct Answer
verified

At a temperature of absolute zero,the volume of an ideal gas is zero.

Correct Answer
verified

Exam 5: Gases and the Kinetic-Molecular Theory

Dry air is approximately 78% nitrogen,21% oxygen and 1% argon,by number of molecules.What is the partial pressure of oxygen in a sample of dry air,if atmospheric pressure is 751 torr?

Correct AnswerverifiedShow Answer

Starting from the Ideal Gas Equation,derive an equation corresponding to Charles' Law,stating all important assumptions or conditions.

Correct AnswerverifiedIdeal Gas Equation is PV = nRT.Charles's...View AnswerShow Answer

An unknown liquid is vaporized in a 273-mL flask by immersion in a water bath at 99°C.The barometric pressure is 753 torr.If the mass of the substance's vapor retained in the flask is 1.362 g,what is its molar mass?

Correct AnswerverifiedShow Answer

Which of the following gases will be the slowest to diffuse through a room?

Correct AnswerverifiedShow Answer

"The rate of effusion of a gas is inversely proportional to the square root of its molar mass" is a statement of _________________ Law.

Correct AnswerverifiedShow Answer

A sample of methane gas,CH4(g) ,occupies a volume of 60.3 L at a pressure of 469 torr and a temperature of 29.3°C.What would be its temperature at a pressure of 243 torr and volume of 60.3 L?

Correct AnswerverifiedShow Answer

Ima Chemist found the density of Freon-11 (CFCl3) to be 5.58 g/L under her experimental conditions.Her measurements showed that the density of an unknown gas was 4.38 g/L under the same conditions.What is the molar mass of the unknown?

Correct AnswerverifiedShow Answer

A sample of carbon dioxide gas at 125°C and 248 torr occupies a volume of 275 L.What will the gas pressure be if the volume is increased to 321 L at 125°C?

Correct AnswerverifiedShow Answer

State Avogadro's Law.

Correct AnswerverifiedEqual volumes of gas...View AnswerShow Answer

At moderate pressures (~ 200 atm) ,the measured pressure exerted by CO2 gas is less than that predicted by the ideal gas equation.This is mainly because

Correct AnswerverifiedShow Answer

Magnesium metal (0.100 mol) and a volume of aqueous hydrochloric acid that contains 0.500 mol of HCl are combined and react to completion.How many liters of hydrogen gas,measured at STP,are produced? Mg(s) + 2HCl(aq) →\to→ MgCl2(aq) + H2(g)

Correct AnswerverifiedShow Answer

Hydrogen peroxide was catalytically decomposed and 75.3 mL of oxygen gas was collected over water at 25°C and 742 torr.What mass of oxygen was collected? (Pwater = 24 torr at 25°C)

Correct AnswerverifiedShow Answer

At a temperature of absolute zero,the volume of an ideal gas is zero.

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified
Ideal Gas Equation is PV = nRT.Charles's...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

A sample of methane gas,CH₄(g) ,occupies a volume of 60.3 L at a pressure of 469 torr and a temperature of 29.3°C.What would be its temperature at a pressure of 243 torr and volume of 60.3 L?

Correct Answer
verified

Ima Chemist found the density of Freon-11 (CFCl₃) to be 5.58 g/L under her experimental conditions.Her measurements showed that the density of an unknown gas was 4.38 g/L under the same conditions.What is the molar mass of the unknown?

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
Equal volumes of gas...
View Answer

At moderate pressures (~ 200 atm) ,the measured pressure exerted by CO₂ gas is less than that predicted by the ideal gas equation.This is mainly because

Correct Answer
verified

Magnesium metal (0.100 mol) and a volume of aqueous hydrochloric acid that contains 0.500 mol of HCl are combined and react to completion.How many liters of hydrogen gas,measured at STP,are produced? Mg(s) + 2HCl(aq) $\to$ MgCl₂(aq) + H₂(g)

Correct Answer
verified

Hydrogen peroxide was catalytically decomposed and 75.3 mL of oxygen gas was collected over water at 25°C and 742 torr.What mass of oxygen was collected? (P_water = 24 torr at 25°C)

Correct Answer
verified

Correct Answer
verified