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

Answer 1

To find the total energy of the reaction, we need to calculate the difference between the energy of the reactant and the energy of the products.

Total energy of the reaction = Energy of the reactant - Energy of the products
Total energy of the reaction = 732 kJ/mol - 630 kJ/mol
Total energy of the reaction = 102 kJ/mol

Since the total energy of the reaction is positive (102 kJ/mol), it means that energy is released during the reaction. Therefore, the reaction is exothermic.

The correct answer is "102 kJ/mol, exothermic".