1. The problem statement, all variables and given/known data http://i.minus.com/juL6gvGzvWdm.png [Broken] 2. Relevant equations Raoult's law: Pressure of solution = Mole fraction of solvent multiplied by vapor pressure of pure solvent. We're assuming non-volatile solutes. 3. The attempt at a solution My solution: https://scontent-b-mia.xx.fbcdn.net/hphotos-prn1/v/556873_10201073170213135_1235629214_n.jpg?oh=a01e718c3f2218dc3d130fd0007be82b&oe=528964FD Prof's solution: http://i.minus.com/jbtmawYMvRpDpX.png [Broken] Who's right?