Practice question

MCQ

Question

A system at constant pressure absorbs 1000 J of heat and expands by 0.4 L against 2.5 atm. What is Δ U? (1 atm·L = 101.3 J)

Options

Choose one · Correct answer highlighted

898.7 J Correct 1101.3 J 1000 J 797.4 J

Explanation

w = -PΔ V = -2.5 × 0.4 × 101.3 = -101.3 J, q = 1000 J, Δ U = q + w = 1000 - 101.3 = 898.7 J.

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