Gases: Chapter Review

Pressure from Force and Area

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What is the pressure in pascals if a force of 4.88 kN is pressed against an area of 235 cm²?

1,150,000 Pa

20.8 Pa

2,080 Pa

208,000 Pa

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Combined Gas Law (Find T)

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A gas starts at 667 mL, 822 torr, and 67°C. Its final volume and pressure are 1.334 L and 2.98 atm. What is the final temperature?

340 K

680 K

170 K

1,874 K

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Volume of a Single Particle

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A sample of 6.022 × 10²³ particles of gas occupies 22.4 L at STP. What volume would 1 particle occupy?

3.72 × 10⁻²³

1.34 × 10⁻²⁵

2.69 × 10⁻²²

3.72 × 10²³

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Weather Balloon at Altitude

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A balloon holds 1.000 mol of He at 760 torr and 22°C (initial volume 24.2 L). What is its volume at 40 km altitude, where the pressure is 5.00 torr and the temperature is −20°C?

24.2 L

3,680 L

3,155 L

131 L

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Density of Air at Sea Level

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Air can be approximated with a molar mass of 28.8 g/mol. What is the density of air at 1.00 atm and 22°C?

0.84 g/L

2.38 g/L

1.19 g/L

28.8 g/L

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Density of CO₂ on Venus

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On Venus the atmospheric pressure is 91.8 atm and the temperature is 460°C. What is the density of CO₂ there?

8.78 g/L

67.2 g/L

1.96 g/L

120 g/L

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Percent Yield with a Collected Gas

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Iron reacts with nitric acid by Fe(s) + 2HNO₃(aq) → Fe(NO₃)₂(aq) + H₂(g). From 23.8 g of Fe, only 446 mL of H₂ is collected over water at 25°C and 733 torr. What is the percent yield?

3.99%

25.1%

96.0%

1.70%

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Which Variables Are Held Constant?

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Gas Law

Boyle's law

Charles's law

Gay-Lussac's law

Held constant

volume and amount

pressure and amount

temperature and amount

Match each gas law to the quantities that stay constant when it is applied.

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Pressure from Force and Area

Correct Answer

Explanation

Combined Gas Law (Find T)

Correct Answer

Explanation

Volume of a Single Particle

Correct Answer

Explanation

Weather Balloon at Altitude

Correct Answer

Explanation

Density of Air at Sea Level

Correct Answer

Explanation

Density of CO₂ on Venus

Correct Answer

Explanation

Percent Yield with a Collected Gas

Correct Answer

Explanation

Which Variables Are Held Constant?

Gas Law

Held constant

Correct Answer

Explanation

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