Apentix/AP Chemistry/Unit 3: Intermolecular Forces and Properties/Question
AP Chemistrymediummcq1 pt

Graham's law describes the rate of effusion of two gases. Which gas effuses faster at the same temperature: O₂ or CH₄?

A.CH₄, because it has the smaller molar mass
B.O₂, because it is heavier
C.Both at the same rate
D.CH₄, because it has more atoms

Explanation

Core Concept

Effusion rate is inversely proportional to the square root of molar mass (rate ∝ 1/√M). CH₄ (16 g/mol) effuses √(32/16) = 1.4 times faster than O₂ (32 g/mol).

Correct Answer

ACH₄, because it has the smaller molar mass

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