2 mol of an ideal gas at 27^(@)C tempera...

2 mol of an ideal gas at `27^(@)C` temperature is expanded reversibly from `2L` to `20L`. Find entropy change `(R = 2 cal mol^(-1) K^(-1))`

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The correct Answer is:

9.2

At constant temperature,
`DeltaS = nRT ln V_2/V_1 = 2.303n RT log V_2/V_1`
` = 2.303 xx 2 xx 2 xx log "" (20)/2 = 9.2 cal K^(-1) mol^(-1)`

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