1. The problem statement, all variables and given/known data A coal-fired plant generates 600 MW of electric power. The plant uses 4:8106 kg of coal each day. The heat produced by the combustion of coal is 3:3107 J/kg. The steam that drives the turbines is at a temperature of 300C, and the exhaust water is at 37C. (a) How much thermal energy is exhausted each day by this plant? (b) How much ice at -10C can be turned into steam at 100C per year by the exhaust from this power plant? 2. Relevant equations Q=mL Q=mcΔT 3. The attempt at a solution For question a) all I did was take the coal used each day and multiplied it by the heat produce by its combustion. I found the thermal energy exhausted each day to be 1.584 x 10^14J. (I think this is right) Question B is where I am having troubles. This is the equation I got: Q=mCice(0-(-10))+mLice+mCwater(100-0)+mLvaporization q/(Cice(10)+Lice+Cwater(100)+Lvice)=m where: Lice=334 J/g Cice=2.1J/gK Cwater=4.2 J/gk Lvice=2.256J/g Q=1.584 x 10^14 Is this right? I getting confused about what energy I should and shouldn't take when trying to find the mass.