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Q.

2 moles of an ideal gas at 27°C are expanded reversibly from 2L to 20L. Find entropy change (in cal/mol K). (R=2 cal/mol K)

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answer is 9.2.

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Detailed Solution

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$\begin{array}{l} ΔS = 2 .303 nRlog \frac{V_{2}}{V_{1}} \\ = 2 .303 \times 2 \times 2 \log \frac{20}{2} = 9 .2 \end{array}$

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2 moles of an ideal gas at 27°C are expanded reversibly from 2L to 20L. Find entropy change (in cal/mol K). (R=2 cal/mol K)