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28 December, 15:30

A vertical piston-cylinder device contains water and is being heated on top of a range. During the process, 10 kJ of heat is transferred to the water, and heat losses from the side walls amount to 80 J. The piston rises as a result of evaporation, and 2 J of work is done by the vapor. Determine the change in the energy of the water for this process.

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  1. 28 December, 15:40
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    Answer: 9.9KJ

    Explanation: Q = U + W + losses

    Q is heat transfered to the water

    U is the change in energy of the system

    W is work done by the system = 2J

    Losses = 80J

    Heat into system is 10kJ = 10000KJ

    Therefore

    U = Q - W - losses

    U = 10000 - 2 - 80 = 9990J

    = 9.9kJ
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