1. The problem statement, all variables and given/known data A closed system comprising a cylinder and frictionless piston contains 1kg of a perfect gas of which molecular mass is 26. The piston is loaded so that the pressure is constant at 200kPa. Heat is supplied causing the gas to expand from 0.5m^3 to 1m^3. Calculate heat supplied 2. Relevant equations w = int-(PdV) PV = nRT q = du - w 3. The attempt at a solution I have worked out w as 100kJ by doing PdV = 200kPa x 0.5 Oh and Cp = 1.08 kJ/kg/K Now am stuck.