When producing hydrogen iodide, the energy of the reactants is 581 kJ/mol, and the energy of the products is 590 kJ/mol. The equation is shown.
H2 + I2 → 2HI
What is the total energy of the reaction? Is this an endothermic or exothermic reaction?
(1 point)
9 kJ/mol, endothermic
9 kJ/mol, endothermic
–9 kJ/mol, exothermic
–9 kJ/mol, exothermic
–9 kJ/mol, endothermic
–9 kJ/mol, endothermic
9 kJ/mol, exothermic
The total energy of the reaction can be calculated by subtracting the energy of the products from the energy of the reactants:
Total energy of the reaction = Energy of reactants - Energy of products
Total energy of the reaction = 581 kJ/mol - 590 kJ/mol
Total energy of the reaction = -9 kJ/mol
Therefore, the total energy of the reaction is -9 kJ/mol.
Since the total energy of the reaction is negative, this indicates that energy is released during the reaction. An exothermic reaction is one that releases energy, so we can conclude that this reaction is exothermic.
The correct answer is:
–9 kJ/mol, exothermic.