1. The problem statement, all variables and given/known data The heat of vaporization is approx the product of the average energy of the escaping molecules (E) and the # molecules per gram, N I want to know, is this is as simple as it sounds 2. Relevant equations so H=E*N? Q=mH 3. The attempt at a solution I'm supposed to find E, but I want to make sure I'm understanding it correctly I get E=(H(v)*MW(h2o))/(N_a)=1.6111 x 10^-20 cal/molecule = 6.7452 x 10^-20 J/molecule or 4.21 x10 eV/molecule I can't find anything on average energy per molecule escaped, so i don't know how to confirm.