Kinetic Molecular Theory

AP Chemistry· difficulty 3/5

Root-mean-square speed of gas particles is

  • A

    Independent of mass

  • B

    Inversely proportional to √M (lighter molecules move faster)

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  • C

    Independent of temperature

  • D

    Proportional to M

Explanation

vrms=3RT/Mv_\text{rms} = \sqrt{3RT/M}. At given T, lighter molecules move faster. Helium escapes Earth's gravity easily.

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