Potential energy diagram of an endothermic reaction

An example figure from the Potential Energy Diagram generator.

Potential energy diagram of an endothermic reaction: products higher than the reactants, with arrows for Ea, the reverse Ea and ΔH — The potential energy of an endothermic reaction: the reactants at 20 kJ/mol, the transition state at 150 kJ/mol and the products higher than the reactants, at 80 kJ/mol. Arrows mark the forward activation energy from the reactants, the reverse activation energy from the products, and ΔH, pointing up from the reactants to the products.

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Answer key

ΔH = +60 kJ/mol: endothermic
Eₐ (forward) = 130 kJ/mol
Eₐ (reverse) = 70 kJ/mol

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