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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

`+414R`

B

`-690R`

C

`+690R`

D

`-414R`

Text Solution

Verified by Experts

The correct Answer is:
A
(a) work done by the system in the isothermal process
`DA is W=2.303nRTlog_(10)(P_D)/(P_A)`
`=2.303xx2Rxx300log_(10)(1xx10^5)/(2xx10^5)=-414R`
Therefore work done on the gas is `+414R`.
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