# For a dilute solution containing a nonvolatile solute,which of the following expressions correctly represents the molar mass of solute ?

$\begin{array}{1 1}M_2=\large\frac{m_2}{(m_1/M_1)}\\M_2=\large\frac{m_2}{(m_1/M_1)(-\Delta p_1/p_1^*)}\\M_2=\large\frac{m_2}{(M_1/m_1)(-\Delta p_1/p_1^*)}\\M_2=\big(\large\frac{m_2M_1}{m_1}\big)\normalsize (-\Delta p_1/p_1^*)\end{array}$

Answer : $M_2=\large\frac{m_2}{(m_1/M_1)(-\Delta p_1/p_1^*)}$
We have
$-\large\frac{\Delta p_1}{p_1^*}$$=x_2=\large\frac{n_2}{n_1+n_2}=\frac{n_2}{n_1}=\frac{(m_2/M_2)}{(m_1/M_1)}$
Hence,$M_2=\large\frac{m_2}{(m_1/M_1)(-\Delta p_1/p_1^*)}$