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27 October, 21:58

Of these gases, which has the fastest-moving molecules (on average) at a given temperature?

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  1. 28 October, 00:43
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    I believe we are choosing between HBr, NO2, and C2H6.

    The molar masses of these compound are:

    Molar mass of HBr = 80.9119

    Molar mass of NO2 = 46.005

    Molar mass of C2H6 = 30.0694

    The speed of the molecule actually is inversely proportional to its molar mass. Hence, the lighter the molecule, the faster it moves.

    Answer:

    C2H6 (ethane)
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