Based on the bond energies given, the standard enthalpy of the reaction, ΔH°(rxn) is -296 kJ.
What is standard enthalpy change of a reaction?
The standard enthalpy change of a reaction is the energy changes involved when substances react under standard conditions to form products.
- ΔH°(rxn) = sum of the bond energies of bonds being broken - sum of the bond energies of the bonds being formed.
The standard enthalpy of the reaction, ΔH°(rxn) is calculated as follows:
Sum of energy of bonds broken = 839 + (2 × 413) + (432 × 2) = 2529 kJ
Sum of energy of bonds formed = 347 + (6 × 413) = 2825 kJ
ΔH°(rxn) = (2529 - 2825) kJ
ΔH°(rxn) = -296 kJ
Therefore, the standard enthalpy of the reaction, ΔH°(rxn) is -296 kJ.
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