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24 January, 14:41

An unknown gas effuses at 0.850 times the effusion rate of nitrogen dioxide, NO2. Estimate the the molar mass of the unknown gas

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  1. 24 January, 15:07
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    Graham's Law,

    Rate 1 / Rate 2 = √[M2/M1]

    Just substitute, remembering M (NO2) = 46 g/mol,

    0.850 = √[46/M1];

    Solving, M1 = 63.7 g/mole. The other gas could be SO2, which has molecular weight 63.9 g/mole.
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