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Two moles of ideal gas at `27^(@)C` temperature is expanded reversibly from 2 litre to 20 liter. Find entropy change `(R=2cal//molK)` .

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Two moles of ideal gas at `27^(@)C` temperature is expanded reversibly from 2 litre to 20 liter. Find entropy change `(R=2cal//molK)` .
A. `92.1`
B. `0`
C. `4`
D. `9.2`
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Correct Answer - A
`DeltaS` (Entropy change)
`=2.303"nRlog"_(10)(V_(2))/(V_(1))`
`=2.303xx2xx2"log"_(10)(20)/(2)`
`=2.303xx2xx2xx1=9.212cal`
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