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24 April, 04:20

An ideal gas in a piston is placed in a refrigerator, which removes 413 J of energy from the gas via cooling. The plunger on the piston is pushed down, which does 70 J of work on the gas.

1)

What is the net change in the internal energy of the gas in the piston?

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  1. 24 April, 05:20
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    The net change in the internal energy of the gas in the piston is - 343J

    Explanation:

    Because heat and workdone are the only means of energy transfer between the system and the surrounding, change in internal energy is given by;

    ∆E = q + w

    q = heat transfer

    w = workdone

    Because heat is lost by the system, the heat transfer is negative

    q = - 413J

    Because work is done on the system, workdone is positive

    w = + 70J

    ∆E = - 413J + 70J

    ∆E = - 343J
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