Two moles of an ideal gas have an initial Kelvin temperature Tᵢ and absolute pressure Pᵢ.The gas undergoes a reversible isothermal compression from an initial volume Vᵢ to a final volume 0.5Vᵢ.
-What is the change in entropy of the sample?

Question

Quizplus · Accepted Answer

The change in entropy for an isothermal process is given by ΔS = nR ln(Vf/Vi). Since the volume is compressed to half, Vf/Vi = 0.5. For 2 moles, ΔS = 2 * 8.31 * ln(0.5) = -16.62 ln(2) J/K.

Two Moles of an Ideal Gas Have an Initial Kelvin