Five moles of an ideal gas at 1 bar and 298 K is expanded into vacuum to double the volume. The work done is : (A) –RT(V2 – V1) (B) Zero (C) –RT in V2 / V1 (D) C2(T2 – T1)

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Question

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

(A) –RT(V2 – V1)
(B) Zero
(C) –RT in V2 / V1
(D) C2(T2 – T1)

Prashant Kotian · Accepted Answer

Correct answer: B. W = –Pext V In expansion against vacuum Pext = 0 So work done is zero.

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