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23 May, 17:05

A sample of an unknown gas effuses in 12.1 min. an equal volume of h2 in the same apparatus under the same conditions effuses in 2.42 min. what is the molar mass of the unknown gas?

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  1. 23 May, 20:10
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    MW H2 = 2

    MW 2 = ?

    rate 1 = 1/12.1

    rate 2 = 2.42

    aopply graham law

    Rate1/rate2 = sqrt (MW2/MW1)

    (12.1/2.42) ^2 = MW2/2

    MW = 2 (12.1/2.42) ^2 = 50 g/mol

    Therefore, the molar mass of the unknown gas is 50 g/mol
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