An energy profile diagram for a chemical reaction displays reactants at 150 kJ and…
CHEMISTRY · Single correct · A Level · Chemistry · Energetics · Energetics
Problem
An energy profile diagram for a chemical reaction displays reactants at 150 kJ and products at 220 kJ relative potential energy. The peak of the curve reaches 300 kJ. Which of the following correctly identifies the sign of ΔH for the reaction and whether it is endothermic or exothermic?
(a) ΔH=+150kJ; the reaction is endothermic.
(b) ΔH=+70kJ; the reaction is endothermic.
(c) ΔH=−70kJ; the reaction is exothermic.
(d) ΔH=+70kJ; the reaction is exothermic.