A gaseous mixture contains \( 70 \% \mathrm{~N}_{2} \) and \( 30 \%...

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A gaseous mixture contains \( 70 \% \mathrm{~N}_{2} \) and \( 30 \% \)
D unknown gas by mass. If the average molar mass of

W. gaseous mixture is \( 37.60 \mathrm{~g} \mathrm{~mol}^{-1} \). Find molecular mass of unknown gas if molar mass of \( \mathrm{N}_{2}=28 \) \( \mathrm{gm} / \mathrm{mol} \).
(A) 42.2
(B) 188
(C) 40
(D) 50
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