two-step endothermic reaction:
1. It is an endothermic reaction, so the energy of products are more than the energy of reactant.
2. It is two step reaction, then there is an interediate stage . In first step Reactant (R) converts to an intermediate (I)and in the secod step intermediate converts to products (P).
3. The second step is rate-limiting step so the activational energy for this step (E2) is must be greater than the ctivational energy of the first step (E1) -------- E2 > E1
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