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COCl2 + H2O --> CO2 + 2HCl ΔH = -73,2 kJ
2NH3 + 2HCl --> 2NH4Cl. ΔH = -352,4 kJ (dikali 2)
CO(NH2)2 + H2O --> CO2 + 2NH3. ΔH = +133,6
Keterangan :
NH3 + HCl --> NH4Cl (dikali 2 agar HCL yang ada di reaksi COCl2 + H2O --> CO2 + 2HCl habis.
(ii) COCl2 + H2O --> CO2 + 2HCl delta H = -73,2 kJ
(iii) NH3 + HCl --> NH4Cl. delta H = -176,2 kJ
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CO(NH2)2 + H2O --> CO2 + 2NH3.
Delta H = +559,2 + (-73,2) + (-176,2) = 309,8 kJ