A mixture of 1 mole of $\mathrm{H}_2 \mathrm{O}$ and 1 mole of CO is taken in a 10 litre container and heated to 725 K . At equilibrium $40 \%$ of water by mass reacts with carbon monoxide according to the equation $\mathrm{CO}(\mathrm{g})+\mathrm{H}_2 \mathrm{O}(\mathrm{g}) \rightleftharpoons \mathrm{CO}_2(\mathrm{~g})+\mathrm{H}_2(\mathrm{~g})$