Question
$$A \to B,\Delta H = - 10kJ\,mo{l^{ - 1}},{E_{a\left( f \right)}} = 50\,kJ\,mo{l^{ - 1}},$$ then $${E_a}$$ of $$B \to A$$ will be
A.
$$40\,kJ\,mo{l^{ - 1}}$$
B.
$$50\,kJ\,mo{l^{ - 1}}$$
C.
$$ - 50\,kJ\,mo{l^{ - 1}}$$
D.
$$60\,kJ\,mo{l^{ - 1}}$$
Answer :
$$60\,kJ\,mo{l^{ - 1}}$$
Solution :
$$\eqalign{
& A \to B,\Delta H = - 10\,kJ\,mo{l^{ - 1}} \cr
& {\text{It is an exothermic reaction}}{\text{.}} \cr
& {E_{a\left( b \right)}} = {E_{a\left( f \right)}} - \left( {\Delta H} \right) \cr
& = 50 - \left( { - 10} \right) \cr
& = 60\,kJ \cr} $$