which label shows the overall enthalpy change and is the reaction exothermic or endothermic?\na…

Answer:

C, endothermic.

Explanation:

Step1: Define enthalpy change

Enthalpy change is $\Delta H=H_{products}-H_{reactants}$.

Step2: Analyze diagram

In the diagram, products (top - level) have higher energy than reactants (bottom - level). So $\Delta H> 0$.

Step3: Determine reaction type

When $\Delta H>0$, heat is absorbed, and the reaction is endothermic. The arrow C represents the enthalpy change from reactants to products.