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MHT CET Medical202623 April 2026Evening ShiftChemistryThermodynamics (C)Actual

What is the work done when an ideal gas (0.300 mol) expands in vacuum?

Options

  1. Azero
  2. Bone
  3. Ctwo
  4. Dthree

Correct answer

A. zero

Step-by-step solution

Work done during the expansion of a gas is given by the expression W = -P_ ext V . For expansion in a vacuum (free expansion), the external pressure P_ ext is zero. Substituting P_ ext = 0 in the expression for work done, we get W = 0 . Thus, the work done when an ideal gas expands in a vacuum is zero. Answer: zero

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