1. The problem statement, all variables and given/known data A 0.2 kg block of ice at -15*C is placed into a pan on a stove, heated to a liquid, and then to vapour with a final temperature of 115*C. Calculate the total amount of heat required for this process. 2. Relevant equations Eh = mc(t2 - t1) Lf (or Lv) = Eh / m 3. The attempt at a solution Etotal = Emelting + Evapourization Emelting = mct = (0.2kg)(4.2x10^3)(0+15*C) = 12 600 J Evapourization = mct = (0.2kg)(4.2x10^3)(115-0*C) = 96 600 J Etotal = 12600 + 96 600J = 109 200 J or 1.1 x 10^5 What am i doing wrong? The answer is 6.2 x 10^5 J.