\( 50 \mathrm{ml} \) of a gas A diffuse through a membrane in the same time as for the diffusion...

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\( 50 \mathrm{ml} \) of a gas A diffuse through a membrane in the same time as for the diffusion of \( 40 \mathrm{ml} \) of gas B under identical conditions of pressure and temperature. If the molecular mass of \( \mathrm{A} \) is 64 , molar mass of \( \mathrm{B} \) would be
(a) 100
(b) 250
(c) 200
(d) 80
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