Two non electrolytes solutes A and B of $( 0.3 \mathrm {~g} )$ and $( 0.9 \mathrm {~g}$ respectively are dissolved in 100 ml solution. (molar mass of A and B are $\mathbf { 3 0 ~ g } / \mathbf { ~ m o l }$ and $\mathbf { 9 0g } / \mathbf { m o l }$ respectively. Calculate of osmotic pressure at 300 K (in atm)