Al(s) + H2O(l)
Al(s) + H2SO4 (ac)
Al(s) + O2(l)
Ag (s) + ZnCl2 (ac)

The activation energy for the reaction no2(g)+co2(g)⟶no(g)+co(g) is ea = 300 kj/mol and the change in enthalpy for the reaction is δh = -100 kj/mol . what is the activation energy for the reverse reaction?