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NEETChemistryThermodynamics (C)

What is the change in internal energy (∆U) for isothermal irreversible expansion of an ideal gas?

Options

  1. A∆U = –w
  2. B∆U = w
  3. C∆U = q
  4. D∆U = 0

Correct answer

D. ∆U = 0

Step-by-step solution

For isothermal irreversible expansion, Joule determined experimentally that q = 0, so ∆U = 0.

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