For an endothermic reaction energy of activation is E_a and enthalpy of reaction is

 $\mathrm{\Delta H}$ (both in kJ mol^–1) . Minimum value of E_a will be

E_a  > $\mathrm{\Delta H}$

For endothermic reactions Energy of products(E_p) is greater than energy of reactants(E_R) 

E_a for forward reaction = $∆\mathrm{H}+$E_a for back ward reaction

E_a > $∆\mathrm{H}$