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18 January, 15:16

In an experiment, an unknown gas effuses at one-half the speed of oxygen gas, which has a molar mass of 32 g/mol. which might be the unknown gas?

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  1. 18 January, 17:22
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    If we assume the rate of diffusion of oxygen is 1, then that of the unknown gas is 1/2.

    From the Grahams law of diffusion;

    R1/R2 = √mm2/√mm1

    1/0.5 = √mm2/√32

    4 = mm2/32

    mm2 = 128

    Therefore the molecular mass of the unknown gas i 128 g/mol

    I therefore think the gas is Hydrogen iodide

    since, H=1, I = 127, thus HI = 128 g/mol
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