An aqueous solution containing 64% by weight of volatile liquid ‘A’ (molecular mass 128) has pressure of 145mm, then vapour pressure of ‘A’ is (V.P. of H2O is 155 mm)

aq. sol. means solvent is H2OGiven aq. sol contains 64% by weight of volatile liq A It is a volatile liquid mixtureWA = 64gAccording to Raoult's law for a volatile liquid mixture