Answer the following question given this paragraph: 

When methane gas is combusted, heat is released, making the reaction exothermic. Specifically, the combustion of 1 mol of methane releases 890.4 kilojoules of heat energy. This information can be shown as part of the balanced equation.


Q: In an exothermic reaction, what, specifically, is released?

 Choices:

- water

- humidity

- precipitation

- heat

A:
heat
