AP Chemistry Unit 3 Practice Test 2026 Properties Of Substances And Mixtures

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At 30 °C a sample of hydrogen is collected over water (P H2O = 31.82 mm Hg at 30 °C) in a 500 mL flask. The total pressure in the collection flask is 745 mm Hg. What will be the percent of error in the amount of hydrogen reported if the correction for the vapor pressure of water is not made?

0.278 moles 0.0154 g 5.0 atm +4.5%

Correct Answer:

+4.5%

Explanation:

Correct answer: +4.5%

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