Molarity (M) of an aqueous solution containing xg of anhyd. $\mathrm{CuSO}_4$ in 500 mL solution at $32^{\circ} \mathrm{C}$ is $2 \times 10^{-1} \mathrm{M}$. Its molality will be $\_\_\_\_$ $\times 10^{-3} \mathrm{~m}$ (nearest integer).
[Given density of the solution $=1.25 \mathrm{~g} / \mathrm{mL}$.]