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An ideal gas undergoes isobaric expansion. Q = 100 J, W = 40 J. Find ΔU:

A140 J
B60 J
C-60 J
D100 J
Answer & Solution
Correct answer: B. 60 J
We have ΔU = Q - W. That is ΔU = 100 - 40. So ΔU = 60 J.
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