A. If a thermodynamic system is taken along a path A along which -83.7 J flows i

Question

A. If a thermodynamic system is taken along a path A along which -83.7 J flows into the system and -29.0 J of work is done on the system, what is the change in internal energy, ?U?
?U: 1 J
B. 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 -72.0 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.)
W: 2 J
C. 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 -87.8 J of work W is done on the system, how much heat, Q, flows into the system?
Q: 3 J

Explanation / Answer

a) -112.7 J internal energy

b) -40 J work done

c)-30.9 J energy

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