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, exothermic
minus 9 kJ/mol, exothermic

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

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

9 kJ/mol, endothermic
9 kJ/mol, endothermic
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Answer 1

ΔE = E(products) − E(reactants) = 590 − 581 = +9 kJ/mol.
Positive sign → the reaction absorbs energy, so it is endothermic.