The threshold energy for a particular reaction is and the actual average energy of the reacting mole — Reaction Mechanism Chemistry Question
Question
The threshold energy for a particular reaction is $120 \text{ kJ mol}^{-1}$ and the actual average energy of the reacting molecules is $45 \text{ kJ mol}^{-1}$. Calculate the activation energy ($E_a$) in $\text{kJ mol}^{-1}$ required for the reaction to proceed.
Answer: 75
💡 Solution & Explanation
The minimum extra amount of energy required by reactant molecules to participate in a reaction is the activation energy ($E_a$). The formula is: $E_a = \text{Threshold energy} - \text{Actual average energy}$. Substituting the given values: $E_a = 120 - 45 = 75 \text{ kJ mol}^{-1}$.
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