A Carnot engine uses methane as the working fluid. At the start of the isothermal expansion, the methane is at 500 kPa, 90C, and occupies a volume of 0.05 m3. The volume at the end of this process is 0.10 m3, and the temperature at the end of the adiabatic expansion is 0C. Determine: - the heat added - the heat rejected.