Question 1

Explain why you do not feel atmospheric pressure pushing on your body.

Accepted Answer

A pressure exists inside your

Question 2

How many grams of carbon dioxide are contained in 550 mL of this gas at STP?

Accepted Answer

A) 0.0245 g 
B) 0.0280 g 
C) 1080 g 
D) 0.560 g 
E) 1.1 g 
A) 0.0245 g 
B) 0.0280 g 
C) 1080 g 
D) 0.560 g 
E) 1.1 g

Question 3

A spacecraft is filled with 0.500 atm of N2 and 0.500 atm of O2.Suppose an object strikes this spacecraft and puts a very small hole in its side.Under these circumstances,

Accepted Answer

A) O2 is lost from the craft 6.9% faster than N2 is lost. 
B) O2 is lost from the craft 14% faster than N2 is lost. 
C) N2 is lost from the craft 6.9% faster than O2 is lost. 
D) N2 is lost from the craft 14% faster than O2 is lost. 
E) N2 and O2 are lost from the craft at the same rate. 
A) O2 is lost from the craft 6.9% faster than N2 is lost. 
B) O2 is lost from the craft 14% faster than N2 is lost. 
C) N2 is lost from the craft 6.9% faster than O2 is lost. 
D) N2 is lost from the craft 14% faster than O2 is lost. 
E) N2 and O2 are lost from the craft at the same rate.

Question 4

A block of dry ice (solid CO2,density = 1.56 g/mL)of dimensions 25.0 cm × 25.0 cm × 25.0 cm is left to sublime (i.e.,to pass from the solid phase to the gas phase)in a closed chamber of dimensions 4.00 m × 5.00 m × 3.00 m.Once the sublimation is complete,what is the partial pressure of carbon dioxide in the chamber at 25°C? (R = 0.08206 L • atm/K • mol,1 atm = 760 mmHg)

Accepted Answer

A) 172 mmHg 
B) 107 mmHg 
C) 0.225 mmHg 
D) 0.172 mmHg 
E) 14.4 mmHg 
A) 172 mmHg 
B) 107 mmHg 
C) 0.225 mmHg 
D) 0.172 mmHg 
E) 14.4 mmHg

Question 5

What is the temperature in Celsius at 77 K,which is the normal boiling point of liquid nitrogen?

Accepted Answer

A) -350°C 
B) -196°C 
C) 350°C 
D) 196°C 
E) 3.55°C 
A) -350°C 
B) -196°C 
C) 350°C 
D) 196°C 
E) 3.55°C

Question 6

A 0.271-g sample of an unknown vapor occupies 294 mL at 140°C and 847 mmHg.The empirical formula of the compound is CH2.What is the molecular formula of the compound? (R = 0.08206 L • atm/K • mol)

Accepted Answer

A) CH2 
B) C2H4 
C) C3H6 
D) C4H8 
E) C6H12 
A) CH2 
B) C2H4 
C) C3H6 
D) C4H8 
E) C6H12

Question 7

For real gases,PV > nRT.

Accepted Answer

A) True 
 B)False

Question 8

_______________ _________ is the pressure exerted by the Earth's atmosphere.

Accepted Answer

Atmospheri

Question 9

A pressure that will support a column of Hg to a height of 256 mm would support a column of water to what height? The density of mercury is 13.6 g/cm3; the density of water is 1.00 g/cm3.

Accepted Answer

A) 348 cm 
B) 1.00 × 102 ft 
C) 18.8 mm 
D) 33.8 ft 
E) 76.0 cm 
A) 348 cm 
B) 1.00 × 102 ft 
C) 18.8 mm 
D) 33.8 ft 
E) 76.0 cm

Question 10

A sample of propane,a component of LP gas,has a volume of 35.3 L at 315 K and 922 torr. What is its volume at STP?
(R = 0.08206 L • atm/K • mol,1 atm = 760 torr)

Accepted Answer

A) 25.2 L 
B) 30.6 L 
C) 33.6 L 
D) 37.1 L 
E) 49.2 L 
A) 25.2 L 
B) 30.6 L 
C) 33.6 L 
D) 37.1 L 
E) 49.2 L

Question 11

If the atmospheric pressure in Denver is 0.8800 atm,what is this pressure expressed in mmHg? (1 atm = 101,325 Pa = 760 torr,1 torr = 1 mmHg)?

Accepted Answer

A) 151.5 mmHg 
B) 1.16 × 10-3 mmHg 
C) 863.6 mmHg 
D) 8.92 × 104 mmHg 
E) 668.8 mmHg 
A) 151.5 mmHg 
B) 1.16 × 10-3 mmHg 
C) 863.6 mmHg 
D) 8.92 × 104 mmHg 
E) 668.8 mmHg

Question 12

How many molecules of N2 gas are present in a 2.5-L flask at 50°C and 650 mmHg? (R = 0.08206 L • atm/K • mol,1 atm = 760 mmHg,1 mole = 6.022 × 1023 molecules)

Accepted Answer

A) 2.1 × 10-23 molecules 
B) 4.9 × 1022 molecules 
C) 3.1 × 1023 molecules 
D) 3.6 × 1025 molecules 
E) 0.081 molecules 
A) 2.1 × 10-23 molecules 
B) 4.9 × 1022 molecules 
C) 3.1 × 1023 molecules 
D) 3.6 × 1025 molecules 
E) 0.081 molecules

Question 13

Gases are sold in large cylinders for laboratory use.What pressure is exerted by 2.500 kg of oxygen gas (O2)stored at 22°C in a 40.0-L cylinder? (R = 0.08206 L • atm/K • mol)

Accepted Answer

A) 3.55 atm 
B) 1.51 ×103 atm 
C) 47.3 atm 
D) 7.56 × 104 atm 
E) 10.2 atm 
A) 3.55 atm 
B) 1.51 ×103 atm 
C) 47.3 atm 
D) 7.56 × 104 atm 
E) 10.2 atm

Question 14

If equal masses of O2(g)and HBr(g)are in separate containers of equal volume and temperature,which one of the following statements is true?

Accepted Answer

A) The pressure in the O2 container is greater than that in the HBr container. 
B) The average velocity of the O2 molecules is less than that of the HBr molecules. 
C) The average kinetic energy of HBr molecules is greater than that of O2 molecules. 
D) The pressures of both gases are the same. 
A) The pressure in the O2 container is greater than that in the HBr container. 
B) The average velocity of the O2 molecules is less than that of the HBr molecules. 
C) The average kinetic energy of HBr molecules is greater than that of O2 molecules. 
D) The pressures of both gases are the same.

Question 15

Which is not a property of a gas?

Accepted Answer

A) The density of a gaseous substance varies strongly with temperature. 
B) A sample of gas assumes the shape and volume of its container. 
C) Gases are highly compressible. 
D) The densities of gases are much larger than those of corresponding liquids. 
E) Gases form homogeneous mixtures with one another in any proportion. 
A) The density of a gaseous substance varies strongly with temperature. 
B) A sample of gas assumes the shape and volume of its container. 
C) Gases are highly compressible. 
D) The densities of gases are much larger than those of corresponding liquids. 
E) Gases form homogeneous mixtures with one another in any proportion.

Question 16

STP stands for _______ _______ _______ _______.

Accepted Answer

standard t

Question 17

Deviations from the ideal gas law are greater at

Accepted Answer

A) low temperatures and low pressures. 
B) low temperatures and high pressures. 
C) high temperatures and high pressures. 
D) high temperatures and low pressures. 
A) low temperatures and low pressures. 
B) low temperatures and high pressures. 
C) high temperatures and high pressures. 
D) high temperatures and low pressures.

Question 18

What is the volume occupied by 25.2 g of CO2 at 0.840 atm and 25°C? (R = 0.08206 L • atm/K • mol)

Accepted Answer

A) 0.060 L 
B) 1.34 L 
C) 16.7 L 
D) 24.2 L 
E) 734 L 
A) 0.060 L 
B) 1.34 L 
C) 16.7 L 
D) 24.2 L 
E) 734 L

Question 19

Packaged cake mixes usually contain baking powder,a mixture of sodium hydrogen carbonate and calcium hydrogen phosphate that react to produce carbon dioxide gas when they come into contact with water.Many such mixes have special instructions for use at high altitudes.Why?

Accepted Answer

The baking powder acts as a le

Question 20

What is the significance of the magnitude of the van der Waals "a" constant?

Accepted Answer

The magnitude of the van der W

Exam 10: Gases

Explain why you do not feel atmospheric pressure pushing on your body.

How many grams of carbon dioxide are contained in 550 mL of this gas at STP?

A spacecraft is filled with 0.500 atm of N2 and 0.500 atm of O2.Suppose an object strikes this spacecraft and puts a very small hole in its side.Under these circumstances,

What is the temperature in Celsius at 77 K,which is the normal boiling point of liquid nitrogen?

A 0.271-g sample of an unknown vapor occupies 294 mL at 140°C and 847 mmHg.The empirical formula of the compound is CH2.What is the molecular formula of the compound? (R = 0.08206 L • atm/K • mol)

For real gases,PV > nRT.

_______________ _________ is the pressure exerted by the Earth's atmosphere.

A pressure that will support a column of Hg to a height of 256 mm would support a column of water to what height? The density of mercury is 13.6 g/cm3; the density of water is 1.00 g/cm3.

A sample of propane,a component of LP gas,has a volume of 35.3 L at 315 K and 922 torr. What is its volume at STP? (R = 0.08206 L • atm/K • mol,1 atm = 760 torr)

If the atmospheric pressure in Denver is 0.8800 atm,what is this pressure expressed in mmHg? (1 atm = 101,325 Pa = 760 torr,1 torr = 1 mmHg)?

How many molecules of N2 gas are present in a 2.5-L flask at 50°C and 650 mmHg? (R = 0.08206 L • atm/K • mol,1 atm = 760 mmHg,1 mole = 6.022 × 1023 molecules)

Gases are sold in large cylinders for laboratory use.What pressure is exerted by 2.500 kg of oxygen gas (O2)stored at 22°C in a 40.0-L cylinder? (R = 0.08206 L • atm/K • mol)

If equal masses of O2(g)and HBr(g)are in separate containers of equal volume and temperature,which one of the following statements is true?

Which is not a property of a gas?

STP stands for _______ _______ _______ _______.

Deviations from the ideal gas law are greater at

What is the volume occupied by 25.2 g of CO2 at 0.840 atm and 25°C? (R = 0.08206 L • atm/K • mol)

Packaged cake mixes usually contain baking powder,a mixture of sodium hydrogen carbonate and calcium hydrogen phosphate that react to produce carbon dioxide gas when they come into contact with water.Many such mixes have special instructions for use at high altitudes.Why?

What is the significance of the magnitude of the van der Waals "a" constant?

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A spacecraft is filled with 0.500 atm of N₂ and 0.500 atm of O₂.Suppose an object strikes this spacecraft and puts a very small hole in its side.Under these circumstances,

A 0.271-g sample of an unknown vapor occupies 294 mL at 140°C and 847 mmHg.The empirical formula of the compound is CH₂.What is the molecular formula of the compound? (R = 0.08206 L • atm/K • mol)

_______ _ is the pressure exerted by the Earth's atmosphere.

A pressure that will support a column of Hg to a height of 256 mm would support a column of water to what height? The density of mercury is 13.6 g/cm³; the density of water is 1.00 g/cm³.

How many molecules of N₂ gas are present in a 2.5-L flask at 50°C and 650 mmHg? (R = 0.08206 L • atm/K • mol,1 atm = 760 mmHg,1 mole = 6.022 × 10²³ molecules)

Gases are sold in large cylinders for laboratory use.What pressure is exerted by 2.500 kg of oxygen gas (O₂)stored at 22°C in a 40.0-L cylinder? (R = 0.08206 L • atm/K • mol)

If equal masses of O₂(g)and HBr(g)are in separate containers of equal volume and temperature,which one of the following statements is true?

STP stands for ___ _ _ ___.

What is the volume occupied by 25.2 g of CO₂ at 0.840 atm and 25°C? (R = 0.08206 L • atm/K • mol)