Question

what is the enthalpy, $delta h$, for this reaction? -30 j 50 j -80 j 30 j

Explanation:

Step1: Recall enthalpy change formula

$\Delta H=H_{products}-H_{reactants}$

Step2: Analyze energy - level diagram

From the diagram, products (C + D) have lower energy than reactants (A + B). The energy difference between products and reactants is the enthalpy change. The products are 30 J lower in energy than the reactants. So $\Delta H=- 30$ J.

Answer:

-30 J