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Molality of pure gas A is (50)/(1.2)m. T...

Molality of pure gas A is `(50)/(1.2)m`. Then molar mass (in gm/mol) of gas will be:

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`m=(n_(A)xx1000)/(W_(A)(gm))=(W_(A))/(M.Wt._(A))xx(1000)/(W_(A))=(1000)/(M.Wt._(A))`
`(50)/(12)=(1000)/(M.Wt._(A))=(24)/(3)=8`
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