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The change in entrophy of 2 moles of i...

The change in entrophy of 2 moles of ideal gas upon isothermal expansion at `243.6 K` from 20 liter until
the pressure becomes 1 atm, is :

A

1.385 cal/K

B

`-1.2 cal//K`

C

`-30 J//mol.K`

D

None of these

Text Solution

Verified by Experts

The correct Answer is:
C
`DeltaS= nRT In (V_(2))/(V_(1))`
`V_(2) = 40`
`V_(1) = 20`
`DeltaS = 2 xx 2 In 2`
` = 4 In 2 = 2.77 cal`
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