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

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How many moles of helium are needed to fill a balloon that has a volume of 6.45 L and a pressure of 800 mm Hg at a room temperature of 24 °C? Assume ideal gas behavior.

0.278 moles 1.278 moles -0.722 moles 0.556 moles

Correct Answer:

0.278 moles

Explanation:

Correct answer: 0.278 moles

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