1. The problem statement, all variables and given/known data 2. Relevant equations Assumptions: Closed System and Quasi-static. p = 90 + 73,386*V -> V = (p-90)/(73,386) v = V/m Q - W = U2 - U1 mass balance: m = m1 = m2 3. The attempt at a solution At state 1: p1 = 110 kPa V1 = (110-90)/(73,386) = 2.725*10-4 m3 v1 = V1/m1 = 2.725*10-4 / 0.1 = 2.725*10-3 m3/kg At state 2: p2 = 1000 kPa V2 = (1000-90)/(73,386) = 124.002*10-4 m3 v2 = V2/m2 = 124.002*10-4 / 0.1 = 124.002*10-3 m3/kg Now I've got two independent properties of the steam at states 1 and 2, pressure and specific volume. I should be able to use these to find their respective internal energies from the steam tables. However, I cannot find where to get these points.. As I'm thinking that by getting the internal energies I can substitute them into the No Flow Energy Equation and find the heat added as there is no work into or out of the system thus: Qin = U2-U1 Any help in the right direction would be appreciated greatly.