What is the standard enthalpy change for the reaction of ClF with F₂ to form ClF3? (All species are in the gas phase.)
2 ClF + O₂ → Cl₂O + F₂O ∆H° = 168 kJ mol–1
2 ClF₃ + 2 O₂ → Cl₂O + 3 F₂O ∆H° = 350 kJ mol–1
2 F₂ + O₂ → 2 F₂O ∆H° = –45 kJ mol–1
ClF + F₂ → ClF₃ ∆H° = ???

Question

What is the standard enthalpy change for the reaction of  ClF with F2 to form ClF3? (All species are in the gas phase.)
2 ClF + O2 → Cl2O + F2O ∆H° = 168 kJ mol–1
2 ClF3 + 2 O2 → Cl2O + 3 F2O ∆H° = 350 kJ mol–1
2 F2  + O2 → 2 F2O ∆H° = –45 kJ mol–1
ClF + F2 → ClF3 ∆H° = ???

Accepted Answer

Correct answer: C.

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