Suppose you have a mixture of 30 mol% pentane and 70 mol% hexane at 1 atm and 60oC. If the Tbubble-point = 55.1oC, calculate the composition of vapor of the first bubble as the mixture is heated. I found p*pentane = 1392.95 and p*hexane = 484.96 using Antoine's equation with T = 55.1. Now I suppose I must use Raoult's law as: yaP = xap*a(@55.1oC) Using this I get xpentane = (0.7*760)/1392.96 = 0.382 However, the answer sheet says xpentane = 0.55. Can anyone figure where I'm mistaken?