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6 August, 22:01

A gas absorbs 10J of heat and is simulataneously comptessed by a constant external pressure of 0.5atm from 4L to2L in volume. What is change in the internal energyA. 101J B. 111J C. 2J D. None of the above

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  1. 7 August, 00:35
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    B. 111 J

    Explanation:

    The change in internal energy is the sum of the heat absorbed and the work done on the system:

    ΔU = Q + W

    At constant pressure, work is:

    W = P ΔV

    Given:

    P = 0.5 atm = 50662.5 Pa

    ΔV = 4 L - 2L = 2 L = 0.002 m³

    Plugging in:

    W = (50662.5 Pa) (0.002 m³)

    W = 101.325 J

    Therefore:

    ΔU = 10 J + 101.325 J

    ΔU = 111.325 J

    Rounded to three significant figures, the change in internal energy is 111 J.
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