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23 January, 08:53

Calculate the expansion work done on the system when exactly 1 mol of solid ammonium chloride, nh4cl, decomposes completely to yield gaseous ammonia, nh3 and hydrogen chloride, hcl at a temperature of 1250 k. treat the expansion as irreversible and the gases formed as perfect.

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  1. 23 January, 09:31
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    The expansion work on an irreversible system is equal to:

    W = - PV

    Assuming that the gas is ideal, therefore:

    PV = nRT

    [P=pressure, V=volume, n=number of moles, R=gas constant, T=absolute temperature]

    Therefore,

    W = - nRT

    W = - (1 mol) * (8.314 J / mol K) * (1250 K)

    W = - 10,392.50 J

    Therefore about 10,392.50 J or 10.4 kJ of work is done on the system.
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