2.32. In the following take Cv= 20.8 and Cp= 29.1 J-mol-1.°C^-1 for nitrogen gas:!! (a) Three moles of nitrogen at 30°C, contained in a rigid vessel, is heated to 250°C.

How much heat is required if the vessel has a negligible heat capacity? If the vessel weighs 100 kg and has a heat capacity of 0.5 kJ.kg^-1.°C^-1, how much heat is required? (b) Four moles of nitrogen at 200°C is contained in a piston/cylinder arrangement.How much heat must be extracted from this system, which is kept at constant pres-sure, to cool it to 40°C if the heat capacity of the piston and cylinder is neglected?