Sample Problem 6.1
Determining the Change in Internal Energy E of a System
SOLUTION:
PLAN:
Define the system and the surroundings, assign signs to q and w, and calculate DE. The answer in units of J is converted to kJ and to kcal.
q = (-) 325 J (system loses heat)
w = (-) 451 J (system does work)
DE = q + w =
-325 J + (-451 J) =
-776 J
= -0.776 kJ
= -0.185 kcal
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