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Sulfonation of benzene has the following mechanism:
(1) 2H2SO4 ⟶ H3O+ + HSO4- + SO3 [fast]
(2) SO3 + C6H6 ⟶ H(C6H5+)SO3- [slow]
(3) H(C6H5+)SO3- + HSO4- ⟶ C6H5SO3- + H2SO4 [fast]
(4) C6H5SO3- + H3O+ ⟶ C6H5SO3H + H2O [fast]
(b) Write the overall rate law in terms of the initial rate of the reaction.