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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
In going to D to A, process is isothermal (figure).
`W= nRT"log"_(e)((P_(1))/(P_(2)))`
`= 2Rxx300"log"_(e)((1xx10^(5))/(2xx10^(5)))`
`= 600Rxx2.303(0-0.3010)= - 415.9R`
`:.` Work done on the gas `= 415.9R`
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