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Q1. Ethane, of volume 0.04 m³, expands isentropically from a pressure and temperature of 6.9 bar, 260℃ respectively, to 1.05 bar and 107℃.

The ethane is then recompressed to the original volume according the law pV^1.4 = constant.

(a) Calculate EACH of the following:

(i) The temperature after recompression; (4)

(ii) The net work transfer; (4)

(iii) The net heat transfer; (3)

(iv) The total change in entropy. (3)

(b) Sketch The sequence of processes on a Temperature-specific entropy diagram. (2)

Note: for ethane R = 277 J/kg K, c_V = 1265 J/kg K and  1.219