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)
102 kJ/mol, endothermic
102 kJ/mol, endothermic
–102 kJ/mol, endothermic
–102 kJ/mol, endothermic
–102 kJ/mol, exothermic
–102 kJ/mol, exothermic
102 kJ/mol, exothermic
To find the total energy of the reaction, we need to calculate the energy change.
Energy change = energy of products - energy of reactants
Energy change = 630 kJ/mol - 732 kJ/mol
Energy change = -102 kJ/mol
Therefore, the total energy of the reaction is -102 kJ/mol.
Since the energy change is negative, the reaction is exothermic.
So the correct answer is: -102 kJ/mol, exothermic