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MHT CET202012 Oct 2020Evening ShiftChemistryThermodynamics (C)Actual

When 2 moles of an ideal gas are expanded isothermally from a volume of 12.5 ~L to 15.0 L against constant external pressure of 760 ~mm Hg . Calculate the amount of work done in joule?

Options

  1. A-253 25 ~J
  2. B-190 0 ~J
  3. C-1924 0 ~J
  4. D-25 325 ~J

Correct answer

A. -253 25 ~J

Step-by-step solution

aligned n &=2 ~mol , ~V ₁=12.5 ~L =12.5 10⁻³ ~m ³, ~V ₂=15.0 ~L =15.0 10⁻³ ~m ³, P &=760 ~mm of Hg =1.013 10⁵ Nm ⁻² ~W &=- P _ ext ( V ₂- V ₁ )=-1.013 10⁵(15.0-12.5) 10⁻³ &=-2.5325 10⁵ 10⁻³ W &=-253.25 ~J aligned

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