The molarity of 1 L orthophosphoric acid ( H_3 PO_4) having 70 % purity by weight (specific gravity 1.54 g cm^-3 ) is ____ M. (Molar mass of H_3…

The molarity of $\displaystyle 1$ L orthophosphoric acid $\displaystyle \left(\mathrm{H}_3 \mathrm{PO}_4\right)$ having $\displaystyle 70 \%$ purity by weight (specific gravity $\displaystyle 1.54 \mathrm{~g} \mathrm{~cm}^{-3}$ ) is $\displaystyle \_\_\_\_$ M. (Molar mass of $\displaystyle \mathrm{H}_3 \mathrm{PO}_4=98 \mathrm{~g} \mathrm{~mol}^{-1}$ )