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In the following take CV = 20.8 and CP = 29.1 J mol-1 oC-1 for nitrogen gas:
(a) Three moles of nitrogen at 30oC contained in a rigid vessel, is heated to 250oC. How much heal is required if the vessel has a negligible heal capacity? If the vessel weighs 100 kg and has a heat capacity of 0.5 kJ kg-1 oC-1, how much heat is required?
(b) Four moles of nitrogen al 200oC is contained in a piston/cylinder arrangement. How much heat must be extracted from this system, which is kept at constant pressure, to cool it to 40'C if the heat capacity of the piston and cylinder is neglected?
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