If 80 g of copper sulphate $\mathrm{CuSO}_4 \cdot 5 \mathrm{H}_2 \mathrm{O}$ is dissolved in delonised water to make 5 L of solution. concentration of the copper sulphate solution is $x \times 10^{-3} \mathrm{~mol} \mathrm{~L}^{-1}$. The value of $x$ is $\_\_\_\_$ . Atomic masses $\mathrm{Cu}: 63.54 \mathrm{u}, \mathrm{S}: 32 \mathrm{u}, \mathrm{O}: 16 \mathrm{u}, \mathrm{H}: 1 \mathrm{u}]$