1. The oxidation of SO2 to SO3 is catalyzed by NO2. The reaction proceeds as follows:

a. Write the balanced equation for the overall oxidation reaction.

b. Why do we consider NO2 as a catalyst and not an intermediate in the reaction?

c. Is this an example of homogeneous catalysis or heterogeneous catalysis? Explain your answer.

2. The following mechanism has been proposed for the gas phase reaction of H2 with ICI:

a. Write the balanced equation for the overall reaction.

b. Identify the intermediate in the mechanism.

c. Write rate laws for each elementary step in the mechanism and specify the molecularity.

d. If the first step is slow and the second step is fast, what rate law do you expect to be observed for the overall reaction?

NO2(g)+SO2(g)NO(g)+SO2(g)2NO(g)+O2(g)2NO2(g) H2(g)+ICl(g)HI(g)+HCl(g)HI(g)+ICl(g)I2(g)+HCl(g)