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The change in entropy for a reversible isothermal expansion of n moles of an ideal gas from volume V₁ to V₂ at temperature T is:

  1. (a) nR ln(V₂/V₁)
  2. (b) nR(V₂-V₁)
  3. (c) nR/T
  4. (d) nRT
Answer and solution

Answer (a) nR ln(V₂/V₁)

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