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Question 800002
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Chemical Thermodynamics and Thermochemistry: First law MCQ

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First lawEasyQuestion 800002

Question

The first law of thermodynamics is:
  1. A
    ΔU = Q + W (or Q − W depending on convention)
    Correct
  2. B
    ΔH = ΔU + PΔV
  3. C
    Entropy of universe increases
  4. D
    G = H − TS

Correct answer

ΔU = Q + W (or Q − W depending on convention)

Explanation

Energy is conserved. In the IUPAC chemistry convention, work done on the system is positive and the first law is ΔU = Q + W. If W instead denotes work done by the system, write ΔU = Q - W.

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