Question

A solution containing 30g of a non-volatile solute were dissolved in 90g water has a vapour pressure of 21.85mm of Hg at 25 degree centigrade.further 18g of water is then added to solution ,the new vapour pressure becomes 22.15mm of Hg at 25Celsius.calculate
a) mol .wt of solute
b) vapour pressure of water at 25 Celsius


IIT jee 2016.......

solve it.....​

Answer 1

refer to the attached file