1. The problem statement, all variables and given/known data A hot rock ejected from a volcano's lava fountain cools from 1100º C to 40.0º C and its entropy decreases by 950 J/K. How much heat transfer occurs from the rock? (Source: OpenStax "College Physics for AP Students", Chapter 15.6) 2. Relevant equations I used the equation ΔSh + ΔSc = ΔStotal, where h and c are the hot and cold states of an object, respectively. ΔS=Q/T, where Q is joules and T is temperature Kelvin. 3. The attempt at a solution Using the equation, we plug in the variables: -Qh/Th + Qc/Tc = -950 I set Qh=Qc -Q/1373 + Q/313 = -950 Solving this equation, I got Q = 3.9 x 105 Joules However the correct answer is 8.01 x 105 J My answer is incorrect. What did I do wrong?