Why is there a net release of energy during the reaction of hydrogen and oxygen to produce water?
A) It takes a lot of energy to isolate hydrogen and oxygen gases in separate containers compared to the energy needed to contain water.
B) Extra energy has to be brought in to get the reaction going and this represents the difference.
C) Different energies are associated with bonds in the reactants compared with those of the products.
D) The production of water is typically associated with a lower energy state.

Net enthalpy applies in this question. The net enthalpy of a reaction is dependent on the relative energy level of the reactants in comparison to those of the products.

Explanation:

If the products are of a lower energy level than the reactants, the enthalpy change is negative meaning there is a release of energy to the environment –exothermic reaction. This is the case in this question.

However if the products have a higher energy state than the reactants, the enthalpy change is positive meaning some energy is drawn from the environment- endothermic reaction.

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