A system is given 400 calories of heat and it does 800 joules of work. How much does the internal energy of the system change in this process (J = 4.18 joules/cal)

  • Option 1)

    2472 J

  • Option 2)

    872 J

  • Option 3)

    654 J

  • Option 4)

    2944 J

 

Answers (1)

As we discussed in concept

First law of Thermodynamics -

Heat imported to a body in is in general used to increase internal energy and work done against external pressure.

- wherein

dQ= dU+dW

 

 Q = 400 cal = 400 x 4.18 J

    = 1672 J

W = 800 J

\therefore\:\Lambda U=Q-W=872\:J


Option 1)

2472 J

This option is incorrect.

Option 2)

872 J

This option is correct.

Option 3)

654 J

This option is incorrect.

Option 4)

2944 J

This option is incorrect.

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