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A gas sample undergoes a reversible isothermal expansion. The figure gives the change ΔS in entropy of the gas versus the final volume Vf of the gas. The scale of the vertical axis is set by ΔS = 65.7 J/K. How many moles are in the sample?

Solve the problem of determining the number of moles in a sample undergoing reversible isothermal expansion. This includes using the formula for entropy change and the second law of thermodynamics. Learn how to calculate moles based on volume and entropy changes.

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