A system gains 767 kJ of heat, resulting in a change in internal energy of the system equal to +151 kJ. How much work is done?

Question

A system gains 767 kJ of heat, resulting in a change in internal energy of the system equal to +151 kJ. How much work is done?

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Eirian 5 years 2021-08-10T00:34:13+00:00 1 Answers 36 views 0

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  1. Nick
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    2021-08-10T00:35:57+00:00
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    Answer:

    The work done on the system is -616 kJ

    Explanation:

    Given;

    Quantity of heat absorbed by the system, Q = 767 kJ

    change in the internal energy of the system, ΔU = +151 kJ

    Apply the first law of thermodynamics;

    ΔU = W + Q

    Where;

    ΔU  is the change in internal energy

    W is the work done

    Q is the heat gained

    W = ΔU  – Q

    W = 151 – 767

    W = -616 kJ (The negative sign indicates that the work is done on the system)

    Therefore, the work done on the system is -616 kJ

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