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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

a) write the overall equation for this reaction.

B) Write the overall rate law for the initial rate of the reaction.

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