12 g of urea is dissolved in 1 litre of water and 68.4 g of sucrose is dissolved in 1 litre of water.The lowering of vapour pressure of the first case is:
Equal to second
12g of urea =mol = 0.2 mole
68.4 g of sucrose == 0.2 mole
As molefraction of both the solutes are same, the lowering of Vapour pressures will be equal.