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  1. 2(NH2)2CO +3O2 ==> 2CO2 + 2N2 + 4H2O dH = -632.2 kJ/mol*2 mol = 1264.4 kJ/2 mol urea or 4 mols H2O.
    dH for 1 mol H2O is 1264.4/4 kJ.

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