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Exam 5: Gases

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Question 21

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In a weather forecast on a Seattle radio station the barometric pressure was reported to be 29.4 inches.What is this pressure in SI units? (1 inch = 25.4 mm, 1 atm = 760 mmHg)

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Question 22

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Calculate the volume occupied by 25.2 g of CO₂ at 0.84 atm and 25°C.R = 0.08206 L.atm/K.mol.

A) 0.060 L
B) 1.34 L
C) 16.9 L
D) 24.2 L
E) 734 L

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Question 23

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A sample of a gas occupies 1.40 *10³ mL at 25°C and 760 mmHg. What volume will it occupy at the same temperature and 380 mmHg?

A 1.07 g sample of a Noble gas occupies a volume of 363 mL at 35°C and 678 mmHg.Identify the Noble gas in this sample? (R = 0.08206 L.atm/K.mol)

A method of removing CO₂ from a spacecraft is to allow the CO₂ to react with sodium hydroxide. (The products of the reaction are sodium carbonate and water.) What volume of carbon dioxide at 25°C and 749 mmHg can be removed per kilogram of sodium hydroxide that reacts?

What is T in the table below?

Gasoline (which can be considered to be octane, C₈H₁₈)burns in oxygen to produce carbon dioxide and water. What volume of oxygen at STP is necessary to react with 1.0 gal of gasoline? (The density of gasoline is 0.81 g/mL.1 gal = 3.78 L)

What is standard temperature and standard pressure?

Gas A and gas B are combined in a flask at initial pressures of 1.0 atm each.The flask is sealed and over time they react to completion to give gas C according to the following chemical equation: 2A(g) + B(g) $\rarr$ C(g) Assuming the temperature stays constant, what will be the total pressure in the flask after the reaction goes to completion?

A gas-filled balloon with a volume of 12.5 L at 0.90 atm and 21°C is allowed to rise to the stratosphere where the temperature is -5°C and the pressure is 1.0 millibar. What is the final volume of the balloon? 1.000 atm = 1.013 bar.

What is the pressure (in atmospheres)of the sample of gas trapped in the open-tube mercury manometer shown below if atmospheric pressure is 735 mmHg and h = 8.3 cm?

A spacecraft is filled with 0.500 atm of N₂ and 0.500 atm of O₂. Suppose a micrometeor strikes this spacecraft and puts a very small hole in it's side. Under these circumstances,

Calculate the density of N₂O gas, in grams per liter, at 110°C and 12 atm.

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

Which of these properties is/are characteristic(s) of gases?

A mixture of three gases has a total pressure of 1,380 mmHg at 298 K. The mixture is analyzed and is found to contain 1.27 mol CO₂, 3.04 mol CO, and 1.50 mol Ar. What is the partial pressure of Ar?

Give five examples of elements that occur as gases at room temperature and pressure?

What is the molar mass of Freon-11 gas if its density is 6.13 g/L at STP?

Calculate the density of CO₂(g) at 100°C and 10.0 atm pressure.

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