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Q.

Five moles of an ideal gas at 1 bar and 298 K is expanded in to vacuum to double the volume. The work done is :

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a

CV(T2−T1)

b

−RT(V2−V1)

c

−RT  ln  V1/V1

d

Zero 

answer is D.

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Detailed Solution

In expansion against vacuum 
Pext=0 w=−PextΔV=0 W=0

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Five moles of an ideal gas at 1 bar and 298 K is expanded in to vacuum to double the volume. The work done is :