Problem: Consider the following elementary reaction step that is a part of a kinetic mechanism:C3H7I + NH3 → C3H7NH3+ + I−Classify the step type and give its predicted rate law.A. bimolecular, rate = k[C3H7I][NH3]B. unimolecular, rate = k[C3H7I]C. bimolecular, rate = k[C3H7I]2D. bimolecular, cannot be determined from balanced equationE. termolecular, rate = k[C3H7I][NH3][C3H7NH3+]-1 [I-] -1

FREE Expert Solution

We are asked to identify the step type and give its predicted rate law.


C3H7I + NH3 → C3H7NH3+ + I


The molecularity of elementary reactions is equal to the sum of the number of molecules of reactants involved in the balanced reaction.

Recall that the rate law only focuses on the reactant concentrations and has a general form of:

rate law=kAxBy

k = rate constant
A & B = reactants
x & y = reactant orders


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Problem Details

Consider the following elementary reaction step that is a part of a kinetic mechanism:

C3H7I + NH3 → C3H7NH3+ + I−

Classify the step type and give its predicted rate law.

A. bimolecular, rate = k[C3H7I][NH3]

B. unimolecular, rate = k[C3H7I]

C. bimolecular, rate = k[C3H7I]2

D. bimolecular, cannot be determined from balanced equation

E. termolecular, rate = k[C3H7I][NH3][C3H7NH3+]-1 [I-] -1

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