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The expression relating molality (m) and mole fraction of solute $(x_2)$ in a solution is (where $M_1$ is the molar mass of solvent)

$\begin{array}{1 1}x_2=\large\frac{mM_1}{1+mM_1}\\x_2=\large\frac{mM_1}{1-mM_1}\\x_2=\large\frac{1+mM_1}{mM_1}\\x_2=\large\frac{1-mM_1}{mM_1}\end{array} $

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Answer : $x_2=\large\frac{mM_1}{1+mM_1}$
We have
answered Jul 17, 2014 by sreemathi.v

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