affecting the compositions of the 2.15.) In the following take Cv = 20.8 and Cp = 29.1 J mol-1 C-1 for nitrogen (a) Three moles of nitrogen at 30C, contained in a rigid vessel, is heated to 250.21. vessel weighs 100 kg and has a heat capacity of 0.5 kJ kg- C-1, how m How much heat is required if the vessel has a negligible heat capacity? If heat is required? (b) Four moles of nitrogen at 200C is contained in a piston/cylinder arrangeme How much heat must be extracted from this system, which is kept at consta pressure, to cool it to 40C if the heat capacity of the piston and cylinder 2.22 noglost 12 gas: a