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JEE Main 20204 SeptemberEvening Shift
Exam
JEE Main
Year
2020
Date
4 September
Shift
Evening Shift
Subject
Chemistry
Chapter
Thermodynamics (C)

JEE Main 2020 · 4 September · Evening Shift · Chemistry · Thermodynamics (C)

Five moles of an ideal gas at 1 bar and 298K is expanded into...

Five moles of an ideal gas at 11 bar and 298K298K is expanded into vacuum to double the volume. The work done is :

Options

  1. ACv(T2−T1){C}_{v}\left({T}_{2} - {T}_{1}\right)
  2. B−RT(V2−V1)- RT\left({V}_{2} - {V}_{1}\right)
  3. C−RTlnV2/V1- RTln{V}_{2} / {V}_{1}
  4. DZero

Correct answer

D. Zero

Step-by-step solution

W=−PextΔVW = - {P}_{\text{ext}}\Delta V

In expansion against vacuum Pext=0{P}_{ext} = 0

So work done is zero.

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