A reaction in which the chemical species, A, B and C react to form products is f

Question

A reaction in which the chemical species, A, B and C react to form products is first order in A, second order in B and zeroth order in C. a. Write the rate law for the reaction. b. By what factor does the reaction rate change if [A] is doubled and [B] and [C] are held constant? c. By what factor does the reaction rate change if [B] is doubled and [A] and [C] are held constant? d. By what factor does the reaction rate change if [C] is doubled and [A] and [B] arc held constant? e. By what factor does the reaction rate change if the concentrations [A], [B] and [C] are all doubled?

Explanation / Answer

Solution:

1. a) Answer: Rate = k[A]1 [B]2

b) [rate of reaction]2/[rate of reaction]1 = [(A2)/(A1)]1

=>  [rate of reaction]2/[rate of reaction]1 = [(2A)/(A)]1

=> [rate of reaction]2/[rate of reaction]1 = 2

c) [rate of reaction]2/[rate of reaction]1 = [(B2)/(B1)]2

=>  [rate of reaction]2/[rate of reaction]1 = [(2B)/(B)]2

=> [rate of reaction]2/[rate of reaction]1 = 4

d) since the order of the reaction with respect to "C" is zero...
it means that it is not involved in the rate determining step
changing its concentration has no effect
Answer: (Rate 2)/(Rate 1) = 1

e) [rate of reaction]2/[rate of reaction]1 = [(A2)/(A1)]1x [(B2)/(B1)]2 X [C2/C1]0

=>  [rate of reaction]2/[rate of reaction]1 =[(2A)/(A)]1x [(2B)/(B)]2 X [2C/C]0

=> [rate of reaction]2/[rate of reaction]1 = 8

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