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Two moles of helium gas are taken over t...

Two moles of helium gas are taken over the cycle ABCDA, as shown in the P-T diagram

The work done on the gas in taking it from D to A is :

A

`-414 R`

B

`276 R`

C

`-690 R`

D

`+ 690 R`

Text Solution

Verified by Experts

The correct Answer is:
A
At constant temperature (isothermal process),
`W_(DA)=nRT log ((P_1)/(P_2))= 2.303xx 2Rxx 300 log ((10^5)/(2xx10^(5)))=2.303xx 600R log (1/2)=0.693xx600R= -414R`.
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