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31 January, 15:00

The combustion of fuel in a piston cylinder causes an internal energy change of - 2836 kJ. The components surrounding the cylinder absorb 963.6 kJ of heat. How much work can be done by the fuel on the piston in the cylinder?

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  1. 31 January, 17:18
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    From first law of thermodynamics

    Q = ΔE + W

    Q is heat added, ΔE is increase in internal energy and W is work done.

    Here Q = - 963.6 kJ, - ve sign because head is absorbed

    ΔE - 2836 kJ, negative sign given (gas cooled)

    Putting these values in the equation above

    - 963.6 = - 2836 + W

    W = 2836 - 963.6 kJ

    = 1872.4 kJ.
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