Question

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 → 2HI2H1

What is the total energy of the reaction? Is this an endothermic or exothermic reaction?

(1 point)
Responses

9 kJ/mol, endothermic
9 kJ/mol, endothermic

9 kJ/mol, exothermic
9 kJ/mol, exothermic

–9 kJ/mol, endothermic
minus 9 kJ/mol, endothermic

–9 kJ/mol, exothermic
minus 9 kJ/mol, exothermic

Answer 1

ΔE = E_products − E_reactants = 590 − 581 = +9 kJ/mol.
Because ΔE is positive, the reaction is endothermic (absorbs 9 kJ/mol).