50 litre of dry $N_2$ is passed through 36g $H_2O$ at $27^{\large\circ}C$. After passage of gas , there is a loss of 1.20g in water . Calculate vapour pressure of water.

Question

$(a)\;249.5mm\qquad(b)\;2.495mm\qquad(c)\;0.249mm\qquad(d)\;24.95mm$