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A system releases 662 kJ of heat and does 140 kJ of work on the surroundings....

A system releases 662 kJ of heat and does 140 kJ of work on the surroundings. What is the change in internal energy of the system?

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Answer #1

The first law of Thermodynamics basically deals with Law of Conservation of mass which states that energy can neither be created nor destroyed.

The mathematical expression is

= change in internal energy.

= heat loss or heat gain. If heat is released then is negative again if heat is supplied then is positive

= work done. If work is done on the system then is positive or if work is done by the system then is negative

In the above question

662kJ heat is released that means

Again 140KJ of work on the surroundings that means 140KJ of work is done by the system that means

Now apply Thermodynamics first law

hence the change in internal energy is -802KJ.

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