Hess’ law can be applied to work out enthalpy changes by using average bond energies, as the diagram indicates. U represents the total of the reactants’ average bond energies, while V represents the total of the products’ average bond energies. For the reaction shown below, which expression would produce a value for W, the enthalpy change of combustion of methane? $\text{CH}_4 + 2\text{O}_2 \rightarrow \text{CO}_2 + 2\text{H}_2\text{O}$
- A$U - V$
- B$U + V$
- C$2(U - V)$
- D$V - U$