Question

An endothermic reaction, $A \to B$ has an activation energy as $x\, kJ/mol$. If the energy change of the reaction is $y\, kJ$, the activation energy of the reverse reaction is

• A. $- x$
• B. $x - y$
• C. $x + y$
• D. $y - x$

Answer 1

Answer: (B)

$x - y$

Answer 2

$x = y + E_{a,b}$
$E_{a,b} = x - y \, kJ$