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HPCET First Law of Thermodynamics — practice questions

Explore 1 free First Law of Thermodynamics questions in HPCET Chemistry. Open each question or exercise to read its content, reference answers and available explanation.

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First Law of Thermodynamics questions and exercises with answers

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The mathematical statement of the **first law of thermodynamics** is:Read the answer and worked solution →

Worked practice questions

The mathematical statement of the **first law of thermodynamics** is:

  1. $\Delta U = q - w$
  2. $\Delta U = q + w$
  3. $\Delta H = q_v$
  4. $\Delta G = \Delta H - T\Delta S$
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Correct answer: B. $\Delta U = q + w$

The first law (with the IUPAC convention that w is work done **on** the system) reads $\Delta U = q + w$, expressing the conservation of energy for an isolated system. $\Delta U = q - w$ uses the older convention where w is work done **by** the system. $\Delta H = q_p$ (constant pressure, not $q_v$) and the Gibbs relation are different state equations.

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