Question

Calculate ∆E for a system that absorbs 664.0 kJ of heat from its surroundings and does...

Calculate ∆E for a system that absorbs 664.0 kJ of heat from its surroundings and does 787.0 kJ of work on its surroundings.

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Answer #1

As we know from First law of thermodynamics that energy is neither created nor destroyed. That means First law of thermodynamics clearly gives the idea about conservation of energy.

Mathematical expression of First law of thermodynamics.

q= heat released or heat gained. If heat is released then it is negative , If it is absorbed then it is positive.

w = work done = work done on the system that means work done by its surroundings , work done is positive and work done by the system that means work done on its surroundings , work done is negative.

Now here

Now apply  First law of thermodynamics.

Hence the Change in internal energy .

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