1. The problem statement, all variables and given/known data Which of the following liquids would form the densest vapor upon heating? A. CH3CH2CH2OH B .CH3(CH2)3CH2Cl C. CH3(CH2)4CH2Br D. (CH3)3CCH2OH 2. Relevant equations None really 3. The attempt at a solution Now I know the answer already, its C. My question is why? I got B, my reasoning was that it is the lightest and has the least inter-molecular forces, which would result in a higher vapor pressure at a given temperature. Now the solution states it is C because at standard conditions, the molar volume is roughly the same. Does this mean, at the same temperature and pressure, the vapor pressure above each solution will be roughly the same?