# Question: Model air as a diatomic ideal gas with M 28 9 g mol

Model air as a diatomic ideal gas with M # 28.9 g/mol, A cylinder with a piston contains 1.20 kg of air at 25.0°C and 200 kPa. Energy is transferred by heat into the system as it is allowed to expand, with the pressure rising to 400 kPa. Throughout the expansion, the relationship between pressure and volume is given by

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