Question

\[\ce{A -> B}\], ∆H = −10 kJ mol⁻¹, E_a(f) = 50 kJ mol⁻¹, then E_a of \[\ce{B -> A}\] will be ______.

Options

• 40 kJ mol⁻¹

• 50 kJ mol⁻¹

• −50 kJ mol⁻¹

• 60 kJ mol⁻¹

Answer 1

\[\ce{A -> B}\], ∆H = −10 kJ mol⁻¹, E_a(f) = 50 kJ mol⁻¹, then E_a of \[\ce{B -> A}\] will be 60 kJ mol⁻¹.

Explanation:

\[\ce{A -> B}\], ∆H = −10 kJ mol⁻¹

It is an exothermic reaction.

E_a(b) = E_a(f) − (∆H)

= 50 − (−10)

= 60 kJ