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, exothermic
–102 kJ/mol, exothermic
102 kJ/mol, exothermic
102 kJ/mol, exothermic
–102 kJ/mol, endothermic
To find the total energy of the reaction, we need to subtract the energy of the products from the energy of the reactant.
Total energy of the reaction = Energy of the reactant - Energy of the products
= 732 kJ/mol - 630 kJ/mol
= 102 kJ/mol
The total energy of the reaction is 102 kJ/mol.
Since the reaction releases energy (energy of the reactant is higher than the energy of the products), the reaction is exothermic. Therefore, the correct answer is:
-102 kJ/mol, exothermic.