CH-1248

Bond energies

Chemistry · Secondary 4 · Hard · Bond energies

Hydrogen burns in oxygen to form water:

2H_2(g) + O_2(g) \rightarrow 2H_2O(l)

.

In terms of bond energies, which statement correctly describes the enthalpy change

\Delta H

for this reaction?

$\Delta H$ is negative because more energy is released in making $O\!- H$ bonds than is absorbed in breaking $H\!- H$ and $O\!=\!O$ bonds.
$\Delta H$ is positive because more energy is released in making $O\!- H$ bonds than is absorbed in breaking $H\!- H$ and $O\!=\!O$ bonds.
$\Delta H$ is negative because more energy is absorbed in breaking $H\!- H$ and $O\!=\!O$ bonds than is released in making $O\!- H$ bonds.
$\Delta H$ is positive because more energy is absorbed in breaking $H\!- H$ and $O\!=\!O$ bonds than is released in making $O\!- H$ bonds.

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