1. The problem statement, all variables and given/known data Suppose 10000 J is transferred between a large thermal reservoir at a temperature of 300 K to another large thermal reservoir at 500 K. What is the net change in entropy of the system? Write an expression for the factor by which the multiplicity of the system changes. For this system, what is the minimum amount of work required to transfer the energy between the two reservoirs, and under what conditions will this calculation be valid? 2. Relevant equations COP = Qc/W = Qc/(Qh-Qc) = Tc/(Th-Tc) DeltaS = -(Qc/Tc) + (Qh/Th) W = Qc/W Qh = Qc + W 3. The attempt at a solution COP = k = 300/(500-300) = 1.5 Qc = 10000 W= 10000/1.5 = 6666.6 Qh = 10000 + 6666.6 = 16666.6 Therefore DeltaS = -(10000/300) + (16666.6/500) = -33.3333 + 33.3332 This doesn't seem right to me but I don't know why. Also this would give me a multiplicity increase by a factor of e^(0/k) which is 1. So that surely cant be right. I apologise if this is really simple and I'm making stupid mistakes.