7. Catalysts80 A proposed mechanism for the oxidation of SO 2 toSO 3 follows: NO

Question

7. Catalysts80
A proposed mechanism for the oxidation of SO2 toSO3 follows: NO2(g) + SO2(g) ---> NO(g) +SO3(g)
2 NO(g) + O2(g) ---> 2 NO2(g) Is this an example ofhomogeneous catalysis or heterogeneous catalysis? If so what is thecatalyst?

There is no catalyst in thisreaction.
heterogeneous catalysis; SO2 isthe catalyst.
homogeneous catalysis; NO2 is thecatalyst.
heterogeneous catalysis; SO2 isthe catalyst.
heterogeneous catalysis; NO2 isthe catalyst.
homogeneous catalysis; NO and NO2are both catalysts
homogeneous catalysis; NO is thecatalyst.

Please help! This is a review and I don't remember anything becauseI haven't taken Chem in 2 and half years! :-/ NO2(g) + SO2(g) ---> NO(g) +SO3(g)
2 NO(g) + O2(g) ---> 2 NO2(g)

Explanation / Answer

homogeneous catalyst. NO2 is the catalyst. NO2 is a gas and in the same phase as the SO2 (homogeneous) NO2 enters the reaction and it is spit back out. Bystoichiometry: 2SO2 + O2 => 2SO3 So 2NO2(g) + 2SO2(g) ---> 2NO(g) +2SO3(g) 2 NO(g) + O2(g) ---> 2NO2(g) 2 NO2 enter and come out. Note that NO is just an intermediate

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