Chemistry 5070 · O Level · Exothermic and endothermic reactions

Exothermic and endothermic reactions — practice question

An energy profile diagram for a reaction is displayed. Which statement is correct?

  • AThe activation energy of the reaction is $(H_3 - H_1)$.
  • BThe activation energy of the reaction is $(H_3 - H_2)$.
  • C$\Delta H$ is $(H_1 - H_2)$.
  • D$\Delta H$ is $(H_1 - H_3)$.

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