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Q12. A mass of 0.08 kg of helium expands reversibly in a cylinder, according to the law pVⁿ = constant, from a pressure of 8.20 bar and a temperature of 900°C to a pressure of 1.3 bar. The final temperature is 362°C.

(a) Sketch the process on p-V and T-S diagrams.

(b) Determine EACH of the following:

(i) The index of expansion;

(ii) The work transfer;

(iii) The heat transfer;

(iv) The change in entropy.

Note: For Helium, R = 2.077 kJ/kg K and C_p = 5.193 kJ/kg K.