# In an exothermic reaction, is heat a product?

Feb 27, 2017

It can be considered to be a product.......

#### Explanation:

Burn a hydrocarbon in air, and heat is a result of the reaction......

$C {H}_{4} \left(g\right) + 2 {O}_{2} \left(g\right) \rightarrow C {O}_{2} \left(g\right) + 2 {H}_{2} O \left(l\right)$

Normally we would report the enthalpy change as $\Delta {H}_{\text{rxn}} = - 891 \cdot k J \cdot m o {l}^{-} 1$. The negative sign indicates that the reaction is exothermic; i.e. heat is a result of the reaction.

We could equally represent the reaction as:

$C {H}_{4} \left(g\right) + 2 {O}_{2} \left(g\right) \rightarrow C {O}_{2} \left(g\right) + 2 {H}_{2} O \left(l\right) + \Delta$

Where $\Delta$ represents the heat output.

Feb 27, 2017