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Exam 10: Gases

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Question 71

Multiple Choice

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What is the mass, in grams, of 2.74 L of CO gas measured at 33°C and 945 mmHg? (R = 0.08206 L • atm/mol • K, 1 atm = 760 mmHg)

A) 0.263 g
B) 2.46 g
C) 3.80 g
D) 35.2 g
E) 206 g

F) A) and E)
G) A) and D)

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Question 72

Multiple Choice

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Choose all answers that apply. Which of the following is/are characteristic(s) of gases?

A) High compressibility
B) Has a static volume regardless of temperature and pressure
C) Formation of homogeneous mixtures regardless of the nature of gases
D) Relatively large distances between molecules
E) Always has a density of 1.00 gram per liter

F) C) and D)
G) A) and C)

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Question 73

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STP stands for ________ _______ ________ ________.

What is the Kelvin temperature at 24°C?

Suppose a sample of gas is composed of 100 molecules, with speeds given below. According to the kinetic molecular theory, if the absolute temperature of the gas is halved, what is a reasonable estimation of the new distribution of speeds of the molecules?

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)

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?

The pressure of hydrogen sulfide gas in a container is 3.565 ×10⁴ Pa. What is this pressure in torr? (1 atm = 101,325 Pa = 760 torr) ?

What is the final temperature of a gas that expands from a volume of 22.4 L at 278 K to a volume of 38.3 L at constant pressure?

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?

When active metals such as magnesium are immersed in acid solution, hydrogen gas is evolved. Calculate the volume of H₂(g) at 30.1°C and 0.85 atm that can be formed when 275 mL of 0.725 M HCl solution reacts with excess Mg to give hydrogen gas and aqueous magnesium chloride. Mg(s) + 2HCl(aq) → MgCl₂(aq) + H₂(g) (R = 0.08206 L • atm/K • mol)

According to the postulates of kinetic molecular theory, the molecules of all gases at a given temperature have the same average speed.

Which of the following gases effuses most rapidly?

Select the gas with the highest average kinetic energy per mole at 298 K.

A gaseous compound is 30.4% nitrogen and 69.6% oxygen by mass. A 5.25-g sample of the gas occupies a volume of 1.00 L and exerts a pressure of 1.26 atm at -4.0°C. What is its molecular formula? (R = 0.08206 L • atm/K • mol)

Arrange the following gases in order of increasing rate of effusion: C₂H₆, Ar, HCl, and PH₃.

Magnesium metal (0.100 mol) and hydrochloric acid (0.500 mol HCl) are combined and react to completion. What volume of hydrogen gas, measured at STP, is produced? Mg(s) + 2HCl(aq) → MgCl₂(aq) + H₂(g) (R = 0.08206 L • atm/K • mol)