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Question: one mole of air initially at 150c and 8 bar...

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One mole of air, initially at 150°C and 8 bar pressure undergoes the following mechanically reversible changes. It expands isothermally to a pressure P2 and is thern cooled at a constant volume to 50°C and a final pressure of 3 bar. Assume that the air behaves as an ideal gas, that the specific heat capacity at constant volume, G, -2R and that the specific heat capacity at constant pressure, C, -72R. where the gas constant, R 8.314 J mol1 K-1 4. a) Draw a fully labelled Pressure-Volume diagram for the process. 5 marks] b) Determine the work done, W, the heat transferred, Q, the change in internal energy, AU and the change in enthalpy, AH for both of the steps in the process and hence the overall values of W, Q, Δυ and ΔΗ for the entire process. Show all your workings. 20 marks]

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