Question

question 9 · 1 point
is the following reaction endothermic or exothermic?
h₂(g) + i₂(g) + energy (heat) → 2 hi(g)
select the correct answer below:
endothermic
exothermic
neither endothermic nor exothermic
both endothermic and exothermic

Explanation:

Step1: Recall reaction - heat relationship

In endothermic reactions, heat is absorbed. In exothermic reactions, heat is released.

Step2: Analyze given reaction

The reaction $\mathrm{H}_{2}(g)+\mathrm{I}_{2}(g)+\text{energy (heat)}\longrightarrow 2\mathrm{HI}(g)$ shows heat is on the reactant - side. This means heat is absorbed for the reaction to occur. So, it is an endothermic reaction.

Answer:

A. endothermic