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Question: Answered & Verified by Expert
An endothermic reaction, $A \rightarrow B$ has an activation energy as $x \mathrm{~kJ} / \mathrm{mol}$. If the energy change of the reaction is $y \mathrm{~kJ}$, the activation energy of the reverse reaction is
ChemistryChemical KineticsCOMEDKCOMEDK 2014
Options:
  • A $-x$
  • B $x-y$
  • C $x+y$
  • D $y-x$
Solution:
2399 Upvotes Verified Answer
The correct answer is: $x-y$
Consider the following graph,



From the above graph
$$
\begin{aligned}
x &=y+E_{a, b} \\
E_{a, b} &=x-y \mathrm{~kJ}
\end{aligned}
$$

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