If a gas mixture of two gases. \( A \) and \( B \) contains gas \( A \) of mole fraction math xm...

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If a gas mixture of two gases. \( A \) and \( B \) contains gas \( A \) of mole fraction math xmlns=http://www.w3.org/1998/Math/MathML class=wrs_chemistrymn0/mnmo./momn3/mn/math. Find molality of \( A \).
(Molar mass of \( \mathrm{A}=10 \mathrm{~g} ; \mathrm{B}=20 \mathrm{~g} \) )
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