Question 1

What mass of water vapor would occupy a volume of 54 L at 200 °C and 76 Torr,assuming ideal behavior?

Accepted Answer

A) 1.8 g 
B) 2.5 g 
C) 4.3 g 
D) 5.4 g 
E) 7.2 g 
A) 1.8 g 
B) 2.5 g 
C) 4.3 g 
D) 5.4 g 
E) 7.2 g

Question 2

A sample of N2(g)effuses through a tiny hole in 19.0 s.How long would it take for a sample of N2O2(g)to effuse under the same conditions?

Accepted Answer

A) 27.8 s 
B) 13.0 s 
C) 8.87 s 
D) 40.7 s 
E) 19.0 s 
A) 27.8 s 
B) 13.0 s 
C) 8.87 s 
D) 40.7 s 
E) 19.0 s

Question 3

What volume would be occupied by a mixture of 0.33 g of hydrogen gas and 0.67 g of nitrogen gas at 157 °C and 4.4 atm?

Accepted Answer

A) 12 L 
B) 4.2 L 
C) 3.1 L 
D) 1.5 L 
E) 0.55 L 
A) 12 L 
B) 4.2 L 
C) 3.1 L 
D) 1.5 L 
E) 0.55 L

Question 4

A balloon filled with helium gas at 20 °C occupies 4.91 L at 1.00 atm.The balloon is immersed in liquid nitrogen at -196 °C,while the pressure is raised to 5.20 atm.What is the volume of the balloon in the liquid nitrogen?

Accepted Answer

A) 0.25 L 
B) 3.6 L 
C) 6.7 L 
D) 97 L 
A) 0.25 L 
B) 3.6 L 
C) 6.7 L 
D) 97 L

Question 5

A gaseous mixture consists of 50.0% O2,25.0% N2,and 25.0% Cl2,by mass.At standard temperature and pressure,the partial pressure of N2(g)is equal to 0.20 atm.

Accepted Answer

A) True 
 B)False

Question 6

2.24 L NH3(g)at 2.0 atm and 0 °C:

Accepted Answer

A) contains 0.050 mole NH3  
B) weighs 1.70 g 
C) contains 6.02 × 1022 molecules of NH3  
D) contains 3.6 × 1023 H atoms 
E) contains 3.6 × 1023 N atoms 
A) contains 0.050 mole NH3  
B) weighs 1.70 g 
C) contains 6.02 × 1022 molecules of NH3  
D) contains 3.6 × 1023 H atoms 
E) contains 3.6 × 1023 N atoms

Question 7

The mutual attraction of gas molecules is an important aspect of van der Waals equation.

Accepted Answer

A) True 
 B)False

Question 8

Convert 1250 mmHg to the equivalent pressure in atmospheres.

Accepted Answer

A) 9.50 × 105 atm 
B) 490 atm 
C) 1.64 atm 
D) 0.608 atm 
E) 1.22 atm 
A) 9.50 × 105 atm 
B) 490 atm 
C) 1.64 atm 
D) 0.608 atm 
E) 1.22 atm

Question 9

The relationship between the "absolute temperature" on the Kelvin scale and the Celsius temperature is given by T(K)= 5/8[t(°C)] - 32.

Accepted Answer

A) True 
 B)False

Question 10

Halothane is one of the modern anesthetics which is nonflammable and relatively safe for patients.What is the molar mass of halothane if 456 milligrams is 52.8 milliliters at 22 °C and 805 Torr?

Accepted Answer

A) 1.06 × 103 g/mol 
B) 209 g/mol 
C) 197 g/mol 
D) 221 g/mol 
E) 14.7 g/mol 
A) 1.06 × 103 g/mol 
B) 209 g/mol 
C) 197 g/mol 
D) 221 g/mol 
E) 14.7 g/mol

Question 11

Calculate the height in meters of a column of liquid ethanol (d = 0.7893 g/cm3)required to exert the same pressure as 760 mmHg (d = 13.60 g/cm3).

Accepted Answer

A) 1.31 × 104 m 
B) 13.1 m 
C) 70.8 m 
D) 0.0708 m 
E) 44.1 m 
A) 1.31 × 104 m 
B) 13.1 m 
C) 70.8 m 
D) 0.0708 m 
E) 44.1 m

Question 12

In the reaction:
2 Al(s)+ 6 HCl(aq)→ 2 AlCl3(aq)+ 3 H2(g)

Accepted Answer

A) 67.2 L of H2(g)at STP is collected for every mole of Al(s)reacted 
B) 33.6 L of H2(g)is collected for every mole of Al(s)reacted,regardless of the temperature and pressure 
C) 1.24 cm3 H2(g)at STP is collected for every milligram of Al(s)reacted 
D) 6 L HCl(aq)is consumed for every 3 L H2(g)produced 
E) 22.4 L of H2(g)is produced for every mole of Al(s)reacted 
A) 67.2 L of H2(g)at STP is collected for every mole of Al(s)reacted 
B) 33.6 L of H2(g)is collected for every mole of Al(s)reacted,regardless of the temperature and pressure 
C) 1.24 cm3 H2(g)at STP is collected for every milligram of Al(s)reacted 
D) 6 L HCl(aq)is consumed for every 3 L H2(g)produced 
E) 22.4 L of H2(g)is produced for every mole of Al(s)reacted

Question 13

A sample of gas weighs 0.250 g and occupies a volume of 112 cm3 at 0 °C and 1 atm.The molar mass of the gas is ________.

Accepted Answer

A) 25.0 g/mol 
B) 50.0 g/mol 
C) 2.23 g/mol 
D) 8.0 g/mol 
E) 200 g/mol 
A) 25.0 g/mol 
B) 50.0 g/mol 
C) 2.23 g/mol 
D) 8.0 g/mol 
E) 200 g/mol

Question 14

A 31.4 mL sample of nitrogen gas was collected over water at 23.7 °C and a barometric pressure of 706 mmHg.What mass of nitrogen was collected? [The vapor pressure of water at 23.7 °C is 22 mmHg.]

Accepted Answer

A) 39.3 mg 
B) 37.7 mg 
C) 34.6 mg 
D) 33.4 mg 
E) 32.5 mg 
A) 39.3 mg 
B) 37.7 mg 
C) 34.6 mg 
D) 33.4 mg 
E) 32.5 mg

Question 15

Gases tend to behave ideally at:

Accepted Answer

A) low temperature and low pressure 
B) low temperature and high pressure 
C) high temperature and low pressure 
D) high temperature and high pressure 
E) gases always behave ideally 
A) low temperature and low pressure 
B) low temperature and high pressure 
C) high temperature and low pressure 
D) high temperature and high pressure 
E) gases always behave ideally

Question 16

53.5 g of an ideal gas of molecular weight = 30.5 g/mol is confined at a pressure of 133 mmHg.The density of the gas is   Compute the temperature of the gas in degrees Celsius.

Accepted Answer

A) 261 °C 
B) 12 °C 
C) -57 °C 
D) 285 °C 
E) -12 °C 
A) 261 °C 
B) 12 °C 
C) -57 °C 
D) 285 °C 
E) -12 °C

Question 17

In the reaction  
How many liters of hydrogen at STP are produced from 50.0 grams of sodium

Accepted Answer

A) (55.0/18.0)(22.4)L 
B) (50.0/23.0)(22.4/2)L 
C) (50.0/23.0)(2)(22.4)L 
D) (50.0/23.0)(22.4)L 
E) (55.0/23.0)(22.4)L 
A) (55.0/18.0)(22.4)L 
B) (50.0/23.0)(22.4/2)L 
C) (50.0/23.0)(2)(22.4)L 
D) (50.0/23.0)(22.4)L 
E) (55.0/23.0)(22.4)L

Question 18

Assuming ideal gas behavior,which of the following gases would have the lowest density at standard temperature and pressure?

Accepted Answer

A) SF6  
B) CF2Cl2  
C) CO2  
D) N2  
E) Kr 
A) SF6  
B) CF2Cl2  
C) CO2  
D) N2  
E) Kr

Question 19

A 4.0 L sample of N2(g)at 760 mmHg is compressed,at constant temperature,to 3.2 atm.What is the final gas volume?

Accepted Answer

A) 950 L 
B) 13 L 
C) 59 L 
D) 1.3 L 
E) 0.77 L 
A) 950 L 
B) 13 L 
C) 59 L 
D) 1.3 L 
E) 0.77 L

Question 20

Which of the following gases has the lowest average speed at 25 °C?

Accepted Answer

A) C3H8 
B) Kr    
C) CH3NH2 
D) SO2 
A) C3H8 
B) Kr    
C) CH3NH2 
D) SO2

Exam 6: Gases

What mass of water vapor would occupy a volume of 54 L at 200 °C and 76 Torr,assuming ideal behavior?

A sample of N2(g)effuses through a tiny hole in 19.0 s.How long would it take for a sample of N2O2(g)to effuse under the same conditions?

What volume would be occupied by a mixture of 0.33 g of hydrogen gas and 0.67 g of nitrogen gas at 157 °C and 4.4 atm?

A balloon filled with helium gas at 20 °C occupies 4.91 L at 1.00 atm.The balloon is immersed in liquid nitrogen at -196 °C,while the pressure is raised to 5.20 atm.What is the volume of the balloon in the liquid nitrogen?

A gaseous mixture consists of 50.0% O2,25.0% N2,and 25.0% Cl2,by mass.At standard temperature and pressure,the partial pressure of N2(g)is equal to 0.20 atm.

2.24 L NH3(g)at 2.0 atm and 0 °C:

The mutual attraction of gas molecules is an important aspect of van der Waals equation.

Convert 1250 mmHg to the equivalent pressure in atmospheres.

The relationship between the "absolute temperature" on the Kelvin scale and the Celsius temperature is given by T(K)= 5/8[t(°C)] - 32.

Halothane is one of the modern anesthetics which is nonflammable and relatively safe for patients.What is the molar mass of halothane if 456 milligrams is 52.8 milliliters at 22 °C and 805 Torr?

Calculate the height in meters of a column of liquid ethanol (d = 0.7893 g/cm3)required to exert the same pressure as 760 mmHg (d = 13.60 g/cm3).

In the reaction: 2 Al(s)+ 6 HCl(aq)→ 2 AlCl3(aq)+ 3 H2(g)

A sample of gas weighs 0.250 g and occupies a volume of 112 cm3 at 0 °C and 1 atm.The molar mass of the gas is ________.

A 31.4 mL sample of nitrogen gas was collected over water at 23.7 °C and a barometric pressure of 706 mmHg.What mass of nitrogen was collected? [The vapor pressure of water at 23.7 °C is 22 mmHg.]

Gases tend to behave ideally at:

53.5 g of an ideal gas of molecular weight = 30.5 g/mol is confined at a pressure of 133 mmHg.The density of the gas is Compute the temperature of the gas in degrees Celsius.

In the reaction How many liters of hydrogen at STP are produced from 50.0 grams of sodium

Assuming ideal gas behavior,which of the following gases would have the lowest density at standard temperature and pressure?

A 4.0 L sample of N2(g)at 760 mmHg is compressed,at constant temperature,to 3.2 atm.What is the final gas volume?

Which of the following gases has the lowest average speed at 25 °C?

Matter: Its Properties and Measurement

Atoms and the Atomic Theory

Chemical Compounds

Chemical Reactions

Introduction to Reactions in Aqueous Solutions

Thermochemistry

Electrons in Atoms

The Periodic Table and Some Atomic Properties

Chemical Bonding I: Basic Concepts

Chemical Bonding Ii: Valence Bond and Molecular Orbital Theories

Intermolecular Forces: Liquids and Solids

Spontaneous Change: Entropy and Gibbs Energy

Solutions and Their Physical Properties

Principles of Chemical Equilibrium

Acids and Bases

Additional Aspects of Acidbase Equilibria

Solubility and Complex-Ion Equilibria

Electrochemistry

Chemical Kinetics

Chemistry of the Main-Group Elements I: Groups 1,2,13,and 14

Chemistry of the Main-Group Elements Ii: Groups 18,17,16,15,and Hydrogen

The Transition Elements

Complex Ions and Coordination Compounds

Nuclear Chemistry

Structures of Organic Compounds

Reactions of Organic Compounds

Chemistry of the Living State

Filters

A sample of N₂(g)effuses through a tiny hole in 19.0 s.How long would it take for a sample of N₂O₂(g)to effuse under the same conditions?

A gaseous mixture consists of 50.0% O₂,25.0% N₂,and 25.0% Cl₂,by mass.At standard temperature and pressure,the partial pressure of N₂(g)is equal to 0.20 atm.

2.24 L NH₃(g)at 2.0 atm and 0 °C:

Calculate the height in meters of a column of liquid ethanol (d = 0.7893 g/cm³)required to exert the same pressure as 760 mmHg (d = 13.60 g/cm^3).

In the reaction: 2 Al(s)+ 6 HCl(aq)→ 2 AlCl₃(aq)+ 3 H₂(g)

A sample of gas weighs 0.250 g and occupies a volume of 112 cm³ at 0 °C and 1 atm.The molar mass of the gas is ________.

A 4.0 L sample of N₂(g)at 760 mmHg is compressed,at constant temperature,to 3.2 atm.What is the final gas volume?