A14

CH₄(g) + 2O₂(g) → CO₂(g) + 2H₂O(g)

\[\Delta H = \sum(\text{BE brutna bindn.}) - \sum (\text{BE bildade bindn.})\]

Brutna bindningar: 

\[4 \cdot [\text{C-H]} + 2 \cdot [\text{O=O]} = (4 \cdot 413 + 2 \cdot 498)\mathrm{kJ/mol} = 2648\mathrm{kJ/mol}\]

Bildade bindningar:

\[2 \cdot [\text{C=O]} + 4 \cdot [\text{O-H]} = (2 \cdot 804 + 4 \cdot 464)\mathrm{kJ/mol} = 3464\mathrm{kJ/mol}\]

Totalt:

\[\Delta H = (2648 - 3464)\mathrm{kJ/mol} = -816\mathrm{kJ/mol}\]