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  • Help me answer: The internal energy change in a system that has absorbed 2 kcals of heat and done 500 J of work is;

The internal energy change in a system that has absorbed 2 kcals of heat and done 500 J of work is;

 

  • Option 1)

    6400 J

  • Option 2)

    5400 J

  • Option 3)

    7900 J

  • Option 4)

    8900 J

 

Answers (1)

As learnt in

First law in Adiabatic Process -

Delta Q= Delta U, + Delta W
 

- wherein

Since Delta Q= 0

(in  Adiabatic Process )

Delta U+Delta W = 0

 

 \Delta U = \Delta Q- W

\Delta Q =2\ Kcal = 2\times 4.2\times 1000\ J

         =8400\ J

W = 500 J

\therefore \Delta U = \left ( 8400 - 500 \right )\ J=7900\ J


Option 1)

6400 J

This option is incorrect

Option 2)

5400 J

This option is incorrect

Option 3)

7900 J

This option is correct

Option 4)

8900 J

This option is incorrect

Posted by

Vakul

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