Phosgene, Cl2CO, is a highly toxic gas that was used as a weapon in World War I. Estimate the enthalpy change for the reaction of carbon monoxide and chloride to produce phosgene
CO(g) Cl2(g) → Cl2CO(g)
given the bond enthalpies of the reactants and products.
Bond Bond Enthalpy (kJ/mol⋅rxn)
C−O 358
C=O 745
C≡O 1046
Cl−Cl 242
C−Cl 339
Phosgene, Cl2CO, is a highly toxic gas that was used as a weapon in World War I. Estimate the enthalpy chan?
2016-06-14 1:10 pm
回答 (1)
2016-06-14 3:09 pm
Covalent bonds in the reactants and products :
CO : one C≡O triple bond
Cl₂ : one Cl-Cl single bond
Cl₂CO : one C=O double bond, two C-Cl single bonds
CO(g) + Cl₂(g) → Cl₂CO(g)
Enthaply change in bond breaking
= +[E(C≡O) + E(Cl-Cl)]
= +[1046 + 242] kJ
= +1288 kJ
Enthalpy change in bond formation
= -[E(C=O) + 2 E(C-Cl)]
= -[745 + 2 × 339] kJ
= -1423 kJ
Enthalpy change of the above reaction, ΔHrxn
= (+1288 kJ) + (-1423 kJ)
= -135 kJ
CO : one C≡O triple bond
Cl₂ : one Cl-Cl single bond
Cl₂CO : one C=O double bond, two C-Cl single bonds
CO(g) + Cl₂(g) → Cl₂CO(g)
Enthaply change in bond breaking
= +[E(C≡O) + E(Cl-Cl)]
= +[1046 + 242] kJ
= +1288 kJ
Enthalpy change in bond formation
= -[E(C=O) + 2 E(C-Cl)]
= -[745 + 2 × 339] kJ
= -1423 kJ
Enthalpy change of the above reaction, ΔHrxn
= (+1288 kJ) + (-1423 kJ)
= -135 kJ
收錄日期: 2021-04-18 15:05:28
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