In the process of taking a gas from state a to state c along the curved path shown in Fig. 15 €“ 24, 80 J of heat leaves the system and 55 J of work is done on the system.
(a) Determine the change in internal energy Ua €“ Uc.
(b) When the gas is taken along the path cda, the work done by the gas is W = 38 J. How much heat Q is added to the gas in the process cda?
(c) If Pa = 2.5Pd, how much work is done by the gas in the process abc?
(d) What is Q for path abc?
(e) If Ua €“ Ub = 19 J, what is Q for the process bc? Here is summary of what is given:

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Qa-e -80J Waic = -55 J Weda = 38 J U, - U, = 10J Pa = 25Pa.