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.