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Molecularity, Rate Expressions and Rate Determining Step

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The hydrogenation of ethylene (C2H4) to ethane (C2H6)is accomplished by the following mechanism:

(1) H2 <--> 2H
(2) C2H4 + H --> C2H5
(3) C2H5 + H --> C2H6
------------------------
Net: H2 + C2H4 --> C2H6

Classify the reaction molecularity in each elementary step. If the overall rate expression for the net reaction is rate = k[H2], which elementary step is the rate determining step?

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https://brainmass.com/chemistry/chemical-kinetics/molecularity-rate-expressions-rate-determining-step-176096

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(A) Molecularity of a reaction step is the total number of reacting molecules in that step. Therefore, the molecularities ...

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All the questions have been answered.

Molecularity of a reaction step is the total number of... The rate expressions for the three steps of the... the rate determining step.

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