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Consider the reaction mechanism below:

2 BF3 → B2F6 slow
B2F6 + NH3 → BF3 + F3BNH3 fast

a. What is the overall reaction that this mechanism is describing?
b. Which step is limiting?
c. What is the rate law for the overall reaction?
d. What is the intermediate compound involved in this reaction?

1 answer

a. 2 BF3 → B2F6
B2F6 + NH3 → BF3 + F3BNH3
-------------------------------------------------
2 BF3 + NH3 → BF3 + F3BNH3

b. The rate determining step is the slow step.
c.rate = k(BF3)^2( NH3)
d. The intermediate is the "compound" that is canceled when the equations are added; i.e., B2F6
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