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27 February, 15:35

Calculate δe, if q = 0.764 kj and w = - 830 j. express your answer using two significant figures.

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  1. 27 February, 17:00
    0
    Given:

    Q = 0.0764 kJ = 764 J, heat input

    W = - 830 J, useful work done

    From the 1st Law of Thermodynamics, the change in internal energy is

    δE = Q - W

    = 764 - (-830)

    = 1594 J = 1.594 kJ

    Answer: 1.59 kJ (two sig. fig.)
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