Hydrogen bromide breaks down into diatomic hydrogen and bromine in the reaction shown. 2HBr → H2 + Br2 The energy of the reactant is 732 kJ/mol, and the energy of the products is 630 kJ/mol. What is the total energy of the reaction? Is this reaction endothermic or exothermic? (1 point) Responses 102 kJ/mol, exothermic 102 kJ/mol, exothermic –102 kJ/mol, endothermic –102 kJ/mol, endothermic 102 kJ/mol, endothermic 102 kJ/mol, endothermic –102 kJ/mol, exothermic –102 kJ/mol, exothermic

Answer 1

To find the total energy of the reaction, we can calculate the difference between the energy of the reactants and the energy of the products:

\[ \text{Energy change} = \text{Energy of reactants} - \text{Energy of products} \] \[ \text{Energy change} = 732 , \text{kJ/mol} - 630 , \text{kJ/mol} = 102 , \text{kJ/mol} \]

Since the energy change is positive (102 kJ/mol), this means that energy is absorbed during the reaction. Therefore, the reaction is endothermic.

The correct response is: 102 kJ/mol, endothermic.