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Q1. From 3.2 bar, 0.13 m³ and 470 K a mass of 0.308 kg of air is expanded polytropically to 2.5 bar, 0.158 m³ and 447 K.

The system is then heated undergoing isobaric (constant pressure) process to its original temperature.

(a) Calculate EACH of the following:

(i) the final volume; (2)

(ii) the polytropic index of expansion; (3)

(iii) the net work; (3)

(iv) the net heat; (5)

(v) the total change in entropy. (3)

Note: C_V, C_P and R are 718 J/kgK, 1005 J/kgK and 287 J/kgK respectively.