Hi there, I'm having a great deal of trouble with this thermodynamics question. Cylinder filled with steam at 350 kN/m2. Initial volume is 0.05 m3. Sufficient heat transfer is effected to raise the internal energy in each cylinder by 50 kJ. The piston is moved slowly to maintain the pressure constant. Piston is of area of 0.1 m2, and the piston travels 0.15 m. Find the magnitude of the heat transfer. So my attempt at the question: dQ = dH (for isobaric case) therefore: dQ = dU + P (V2-V1) and therefore dQ = 50kJ + 350(1.55-0.05) =575 kJ What am I doing wrong? What am I missing?