Latent heat — UPSC Physics Optional CSE 1991 Paper I

The density of steam at 100^\circ\text{C} is nearly 0.60 \times 10^{-3}\text{ kg/litre} and its latent heat is 2.31 \times 10^6\text{ J/kg}. Calculate the change in the boiling point of water if air pressure changes from 76.0\text{cm} to 70.0\text{cm} of Hg.