A system absorbs 250 J of heat and does 100 J of work on the surroundings. What is the change in its internal energy?
Correct answer B. +150 J
Explanation
With ΔU = q + w, q = +250 J (absorbed) and w = −100 J (work done by the system). ΔU = 250 − 100 = +150 J.
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