A system does 506 kj of work, and loses 266 kj of heat to the surroundings. what is the change in internal energy of the system?

Question

A system does 506 kj of work, and loses 266 kj of heat to the surroundings. what is the change in internal energy of the system?

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Verity 4 years 2021-08-02T16:17:03+00:00 2 Answers 50 views 0

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  1. RobertKer
    0
    2021-08-02T16:18:20+00:00
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    Answer:

    The change in internal energy of the system = -772kJ

    Explanation:

    Given :

    Heat lost by the system , a = -266KJ

    Workdone by the system, W = -506KJ

    The first law of thermodynamics states that:

    Change in internal energy = q + w

    Substituting values into the equation

    Change in internal energy = (-266KJ) + (-506KJ)

    Change in internal energy = -722KJ

  2. thanhcong
    0
    2021-08-02T16:18:53+00:00
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    Answer: The internal energy decreases by an amount of 722 kj

    Explanation:

    In thermodinamics we have that:

    dU = dQ – dW

    U is the internal energy, Q is the heat and W is the work that the system does.

    this means that the change in the internal energy is equal to the change in the heat minus the change in the work.

    Here we know that the system does 506kj of work and loses 266kj of heat (this means that dQ = -266kj, because the system loses heat), then we have that the total change in energy would be:

    dU = -266kj – 506kj = -722kj

    The internal energy decreases by an amount of 722 kj

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