$\begin{array}{1 1}M_2=\large\frac{m_2}{V}\frac{RT}{\Pi}\\M_2=\large\frac{m_2}{V}\frac{\Pi}{RT}\\M_2=m_2\large\frac{RT}{\Pi}\\M_2=m_2\large\frac{\Pi}{RT}\end{array} $