Question 1

What is the density of CO2(g)at 100.°C and 10.0 atm pressure? (R = 0.08206 L • atm/K • mol)

Accepted Answer

A) 1.44 g/L 
B) 134 g/L 
C) 44.0 g/L 
D) 53.6 g/L 
E) 14.4 g/L 
A) 1.44 g/L 
B) 134 g/L 
C) 44.0 g/L 
D) 53.6 g/L 
E) 14.4 g/L E

Question 2

Which represents the definition of pressure?

Accepted Answer

A) volume/density 
B) temperature × area 
C) moles/volume 
D) force/area 
E) volume × force 
A) volume/density 
B) temperature × area 
C) moles/volume 
D) force/area 
E) volume × force D

Question 3

At what temperature is the root mean square speed of helium gas equal to that of oxygen gas at 300.K?

Accepted Answer

A) 37.5 K 
B) 75 K 
C) 106 K 
D) 292 K 
E) 2400.K 
A) 37.5 K 
B) 75 K 
C) 106 K 
D) 292 K 
E) 2400.K A

Question 4

What is the formula which describes the relationship between the pressure and volume at constant temperature and constant number of moles?

Accepted Answer

A) PV = k1 
B) V/P = k1 
C) P/V = k1 
D) k1P = V 
E) P = -k1V 
A) PV = k1 
B) V/P = k1 
C) P/V = k1 
D) k1P = V 
E) P = -k1V

Question 5

A sample of nitrogen gas has the temperature drop from 250.°C to 150.°C at constant pressure. What is the final volume if the initial volume is 310.mL?

Accepted Answer

A) 0.186 L 
B) 0.251 L 
C) 0.383 L 
D) 0.410 L 
E) 0.517 L 
A) 0.186 L 
B) 0.251 L 
C) 0.383 L 
D) 0.410 L 
E) 0.517 L

Question 6

Calculate the volume of H2(g)at 273 K and 2.00 atm that will be formed when 275 mL of 0.725 M HCl solution reacts with 50.0 g Zn(s)to give hydrogen gas and aqueous zinc chloride.
(R = 0.08206 L • atm/K • mol)

Accepted Answer

A) 0.56 L 
B) 1.12 L 
C) 2.23 L 
D) 4.47 L 
E) 3.54 L 
A) 0.56 L 
B) 1.12 L 
C) 2.23 L 
D) 4.47 L 
E) 3.54 L

Question 7

If 2.3 mol of a gas occupies 50.5 mL,how many moles of the gas will occupy 85.5 mL at the same temperature and pressure?

Accepted Answer

A) 1.4 mol 
B) 0.59 mol 
C) 3.9 mol 
D) 0.26 mol 
E) 2.3 mol 
A) 1.4 mol 
B) 0.59 mol 
C) 3.9 mol 
D) 0.26 mol 
E) 2.3 mol

Question 8

What is the pressure in atmospheres exerted by a column of water that is 12.5 m high? (density of water = 1.00g/cm3; gravitational constant = 9.80665 m/s2,1 atm = 101,325 Pa = 760 torr = 760 mmHg)

Accepted Answer

A) 123 atm 
B) 1.23 × 105 atm 
C) 0.785 atm 
D) 1.21 atm 
E) 1.23 × 10-3 atm 
A) 123 atm 
B) 1.23 × 105 atm 
C) 0.785 atm 
D) 1.21 atm 
E) 1.23 × 10-3 atm

Question 9

Which sample of gas is least likely to behave ideally?

Accepted Answer

A) 1 mol He(g)at 400 K,1 atm pressure 
B) 1 mol Ne(g)at 400 K,1 atm pressure 
C) 1 mol H2(g)at 400 K,1 atm pressure 
D) 1 mol O2(g)at 400 K,1 atm pressure 
E) 1 mol H2O(g)at 400 K,1 atm pressure 
A) 1 mol He(g)at 400 K,1 atm pressure 
B) 1 mol Ne(g)at 400 K,1 atm pressure 
C) 1 mol H2(g)at 400 K,1 atm pressure 
D) 1 mol O2(g)at 400 K,1 atm pressure 
E) 1 mol H2O(g)at 400 K,1 atm pressure

Question 10

A sample of nitrogen gas is confined to a 14.0-L container at 375 torr and 37.0°C.How many moles of nitrogen are in the container? (R = 0.08206 L • atm/K • mol,1 atm = 760 torr)

Accepted Answer

A) 0.272 mol 
B) 2.27 mol 
C) 3.69 mol 
D) 206 mol 
E) 227 mol 
A) 0.272 mol 
B) 2.27 mol 
C) 3.69 mol 
D) 206 mol 
E) 227 mol

Question 11

Which of the following gases effuses most rapidly?

Accepted Answer

A) nitrogen 
B) oxygen 
C) hydrogen chloride 
D) ammonia 
E) carbon monoxide 
A) nitrogen 
B) oxygen 
C) hydrogen chloride 
D) ammonia 
E) carbon monoxide

Question 12

Which of the following is/are characteristic(s)of gases?

Accepted Answer

A) High compressibility 
B) Relatively large distances between molecules 
C) Formation of homogeneous mixtures regardless of the nature of gases 
D) Choice 1 and 2 only 
E) Choice 1,2,and 3 
A) High compressibility 
B) Relatively large distances between molecules 
C) Formation of homogeneous mixtures regardless of the nature of gases 
D) Choice 1 and 2 only 
E) Choice 1,2,and 3

Question 13

In the van der Waals equation,the constant a is a constant that is part of a correction factor for _________.

Accepted Answer

A) the volume of the gas 
B) the temperature of the gas 
C) the pressure of the gas 
D) the ideal gas constant 
A) the volume of the gas 
B) the temperature of the gas 
C) the pressure of the gas 
D) the ideal gas constant

Question 14

Which of the following gas molecules have the highest average kinetic energy at 25°C?

Accepted Answer

A) H2 
B) O2 
C) N2 
D) Cl2 
E) All the gases have the same average kinetic energy. 
A) H2 
B) O2 
C) N2 
D) Cl2 
E) All the gases have the same average kinetic energy.

Question 15

Freon-12,CF2Cl2,which has been widely used in air conditioning systems,is considered a threat to the ozone layer in the stratosphere.Calculate the root-mean-square velocity of Freon-12 molecules in the lower stratosphere where the temperature is -65°C.

Accepted Answer

A) 20 m/s 
B) 120 m/s 
C) 207 m/s 
D) 260 m/s 
E) 4.4 × 104 m/s 
A) 20 m/s 
B) 120 m/s 
C) 207 m/s 
D) 260 m/s 
E) 4.4 × 104 m/s

Question 16

The molecules of different samples of an ideal gas have the same average kinetic energies at the same ________.

Accepted Answer

A) pressure 
B) temperature 
C) volume 
D) density 
A) pressure 
B) temperature 
C) volume 
D) density

Question 17

What is the density of carbon dioxide gas at -25.2°C and 98.0 kPa? (R = 0.08206 L • atm/K • mol,1 atm = 101,325 Pa)

Accepted Answer

A) 0.232 g/L 
B) 0.279 g/L 
C) 0.994 g/L 
D) 1.74 g/L 
E) 2.09 g/L 
A) 0.232 g/L 
B) 0.279 g/L 
C) 0.994 g/L 
D) 1.74 g/L 
E) 2.09 g/L

Question 18

In the van der Waals equation,the constant b is a constant that is part of a correction factor for _________.

Accepted Answer

A) the volume of the gas 
B) the temperature of the gas 
C) the pressure of the gas 
D) the ideal gas constant 
A) the volume of the gas 
B) the temperature of the gas 
C) the pressure of the gas 
D) the ideal gas constant

Question 19

A sample of an ideal gas has its volume doubled while its temperature remains constant.If the original pressure was 100 torr,what is the new pressure?

Accepted Answer

A) 10 torr 
B) 50 torr 
C) 100 torr 
D) 200 torr 
E) 1000 torr 
A) 10 torr 
B) 50 torr 
C) 100 torr 
D) 200 torr 
E) 1000 torr

Question 20

A gas sample occupies 8.76 L at a temperature of 37°C.What is the volume if the temperature is lowered to 0°C at constant pressure?

Accepted Answer

A) 9.95 L 
B) 0 L 
C) 4.22 L 
D) 74.1 L 
E) 7.71 L 
A) 9.95 L 
B) 0 L 
C) 4.22 L 
D) 74.1 L 
E) 7.71 L

Exam 10: Gases

What is the density of CO2(g)at 100.°C and 10.0 atm pressure? (R = 0.08206 L • atm/K • mol)

Which represents the definition of pressure?

At what temperature is the root mean square speed of helium gas equal to that of oxygen gas at 300.K?

What is the formula which describes the relationship between the pressure and volume at constant temperature and constant number of moles?

A sample of nitrogen gas has the temperature drop from 250.°C to 150.°C at constant pressure. What is the final volume if the initial volume is 310.mL?

Calculate the volume of H2(g)at 273 K and 2.00 atm that will be formed when 275 mL of 0.725 M HCl solution reacts with 50.0 g Zn(s)to give hydrogen gas and aqueous zinc chloride. (R = 0.08206 L • atm/K • mol)

If 2.3 mol of a gas occupies 50.5 mL,how many moles of the gas will occupy 85.5 mL at the same temperature and pressure?

What is the pressure in atmospheres exerted by a column of water that is 12.5 m high? (density of water = 1.00g/cm3; gravitational constant = 9.80665 m/s2,1 atm = 101,325 Pa = 760 torr = 760 mmHg)

Which sample of gas is least likely to behave ideally?

A sample of nitrogen gas is confined to a 14.0-L container at 375 torr and 37.0°C.How many moles of nitrogen are in the container? (R = 0.08206 L • atm/K • mol,1 atm = 760 torr)

Which of the following gases effuses most rapidly?

Which of the following is/are characteristic(s)of gases?

In the van der Waals equation,the constant a is a constant that is part of a correction factor for _________.

Which of the following gas molecules have the highest average kinetic energy at 25°C?

Freon-12,CF2Cl2,which has been widely used in air conditioning systems,is considered a threat to the ozone layer in the stratosphere.Calculate the root-mean-square velocity of Freon-12 molecules in the lower stratosphere where the temperature is -65°C.

The molecules of different samples of an ideal gas have the same average kinetic energies at the same ________.

What is the density of carbon dioxide gas at -25.2°C and 98.0 kPa? (R = 0.08206 L • atm/K • mol,1 atm = 101,325 Pa)

In the van der Waals equation,the constant b is a constant that is part of a correction factor for _________.

A sample of an ideal gas has its volume doubled while its temperature remains constant.If the original pressure was 100 torr,what is the new pressure?

A gas sample occupies 8.76 L at a temperature of 37°C.What is the volume if the temperature is lowered to 0°C at constant pressure?

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Reactions in Aqueous Solutions

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Acid-Base Equilibria and Solubility Equilibria

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Nonmetallic Elements and Their Compounds

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Filters

What is the density of CO₂(g)at 100.°C and 10.0 atm pressure? (R = 0.08206 L • atm/K • mol)

Calculate the volume of H₂(g)at 273 K and 2.00 atm that will be formed when 275 mL of 0.725 M HCl solution reacts with 50.0 g Zn(s)to give hydrogen gas and aqueous zinc chloride. (R = 0.08206 L • atm/K • mol)

What is the pressure in atmospheres exerted by a column of water that is 12.5 m high? (density of water = 1.00g/cm³; gravitational constant = 9.80665 m/s²,1 atm = 101,325 Pa = 760 torr = 760 mmHg)

Freon-12,CF₂Cl₂,which has been widely used in air conditioning systems,is considered a threat to the ozone layer in the stratosphere.Calculate the root-mean-square velocity of Freon-12 molecules in the lower stratosphere where the temperature is -65°C.