Ethanol-water mixture forms an azeotrope boiling at 351.4 K under a pressure of 101.3 kPa and its composition is 89.4% (mol) ethanol. The vapour pressures of ethanol and water at 351.4 K are 100 kPa and 44 kPa respectively. Using van Laar method and assuming that the ration of vapour pressures remains constant, calculate the composition of the vapour in equilibrium with a liquid containing 70 % ethanol