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Two moles of ideal gas at 27^(@)C temper...

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

Text Solution

Verified by Experts

The correct Answer is:
D
For isothermal reversible expansion
`w=q=nRTxx2.303"log"(V_(2))/(V_(1))`
`=2RTxx2.303"log"20/2`
`2xx2xxTxx2.303xx1=9.2T`
Entropy change `DeltaS=q/T=(9.2T)/T=9.2` cal
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