1. The problem statement, all variables and given/known data A glass mug has mass 125g empty. It contains 180g of coffee. Both are at 70 C. I add 15g of creme at 5 C. Find final temperature. Assume creme has specific heat of 2900 J/kg.C . 2. Relevant equations Q = m C (delta)T in joules or Kcalories m = mass in kg C is specific heat where C-coffee 1 kcal/kg.C C-glass .2 kcal/kg.C C-creme 2900 J/kg.C delta T is *change* in temperature 3. The attempt at a solution Attempt at solution: First I don't see a "change" in temperature. But I'm somehow suppose to apply the above formula for Q-heat energy. There are 3 Qs .. 2 at 70 C .. and 1 at 5 C. I am somehow suppose to weight these separate energies, calculate a change in temperature. Then show the final equilibrium temperature. I can only guess that I can do something like Q-coffee = mC-coffee x 70 to get an absolute ?? energy Q-glass = mC-glass x 70 Q-creme = mC-creme x 5 and somehow weight the absolute thermal energies to get delta-T .. and then T ???????