If a thermodynamic system is taken along a path A along which -22.3 J flows into

Question

If a thermodynamic system is taken along a path A along which -22.3 J flows into the system and -29.0 J of work is done on the system, what is the change in internal energy, ?U? If the same system is taken along a second path B for which the endpoints are the same so that ?U is the same, but -59.0 J of heat Q flows into the system, what is the work W done along that path? (?U only depends on the endpoints of the path, not the whole path. Q and W depend upon the whole path.) If further this same system is taken along a third path C for which the endpoints are the same so that ?U is the same, but -94.2 J of work W is done on the system, how much heat, Q, flows into the system?

Explanation / Answer

dU = Q + W = -22.3 - 29=-51.3 J

B) so W = dU - Q = -51.3 + 59 = 7.7 J

C) Q = dU - W = -51.3 + 94.2= 42.9 J

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