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Calculate the internal energy for a system that absorbs 100kJ of heat and had 65kJ of...

Calculate the internal energy for a system that absorbs 100kJ of heat and had 65kJ of work done to it. please show steps.

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Answer #1

The amount of heat energy absorbed , q = +100 kJ

Work done , W = -65 kJ

According to first law of thermodynamics q = E + W

So internal energy , E = q - W

                                = + 100 - (-65) kJ

                                = 165 kJ

Therefore the internal energy of the system is +165 kJ

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