In the process abc, 85 J of heat flows in the system and the work done by the sy

Question

In the process abc, 85 J of heat flows in the system and the work done by the system is 50 J as seen in the graph below.

a) How much heat flows in the system in the adc process if the ?

b) When the system goes by the process cea the absolute value of the work done by the system is 27 J. How much heat flows in the system in this process?

Explanation / Answer

In the process abc, the change in internal energy would be Q-W = 85-50 = 35J So, Uc-Ua = 35J In the process cea, the absolute work done is 27J. So, the heat flown in process would be (Uc-Ua)+W = -35+27 = -8J Negative sign shows that the heat flows out of the system which is obvious as the temperature decreased(evident from Uc-Ua > 0) The first part of question is unclear.. if you know the pressure at a or d then work done will be P(Vd-Va). So heat will be P(Vd-Va) + (Uc-Ua). No work will be done from d to a.

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