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MHT CET202411 May 2024Morning ShiftChemistryThermodynamics (C)Actual

An ideal gas expands against constant external pressure of 2 bar from 5 lit to 8 lit and absorbs 10 kJ of heat. What is U of the system?

Options

  1. A10600 J
  2. B9400 J
  3. C-10600 J
  4. D-9400 J

Correct answer

B. 9400 J

Step-by-step solution

array ll & W=-P_ ext V=-2 (8-5)=-6 ~L bar & 1 ~L bar =100 ~J & W=-600 ~J =-0.6 ~kJ ( 1 ~kJ =1000 ~J ) & Q=+10 ~kJ array According to the first law of thermodynamics, aligned & U = Q + W & U =+10 ~kJ +(-0.6 ~kJ )=9.4 ~kJ =9400 ~J aligned

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