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?
Responses
102 kJ/mol, exothermic
–102 kJ/mol, exothermic
102 kJ/mol, endothermic
–102 kJ/mol, endothermic
To calculate the total energy of the reaction, we need to find the difference between the energy of the reactant and the energy of the products.
Total energy of the reaction = Energy of reactant - Energy of products
= 732 kJ/mol - 630 kJ/mol
= 102 kJ/mol
The total energy of the reaction is 102 kJ/mol.
Since the energy of the products is lower than the energy of the reactant, this reaction is exothermic. Therefore, the correct answer is:
102 kJ/mol, exothermic