The solubility of oxygen in water is $2.43\times 10^{-3}$ mole/litre at $25^{\large\circ}$C and 1.0atm pressure.Calculate the concentration of oxygen at $25^{\large\circ}$C and 0.2atm pressure.

Question

$\begin{array}{1 1}4.86\times 10^{-4}mole\\3.86\times 10^{-4}mole\\2.86\times 10^{-4}mole\\1.86\times 10^{-4}mole\end{array} $