Given the formula for change in internal energy, U = Q + W, calculate work for a
system that absorbs 350 kJ of heat and for which U = 150 kJ. Is the work done on
the system or by the system? Does the system expand or contract?
W = U - Q = 150 - 350 = -200 kJ
Work is negative, which means work is done by the system on its surroundings.
W = -pdV, W is negative, then dV is positive, which means that gas expands.
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