Problem 2.209

A small amount of water and its saturated vapour are enclosed in a vessel at a temperature $t=100^{\circ} \mathrm{C} .$ How much (in per cent) will the mass of the saturated vapour increase if the temperature of the system goes up by $\Delta T=1.5 \mathrm{~K}$ ? Assume that the vapour is an ideal gas and the specific volume of water is negligible as compared to that of vapour.