Question

The reaction A(aq) + B(aq) → Products(aq) was studied, and the following data were obtained: [A]0...

The reaction

A(aq) + B(aq) → Products(aq)

was studied, and the following data were obtained:

[A]0 (mol/L) [B]0 (mol/L) Initial rate (mol/L•s)
0.16 0.24 3.76×10-2
0.080 0.16 1.25×10-2
0.040 0.12 4.70×10-3
0.32 0.12 3.76×10-2


The order of the reaction in A is _____.

Homework Answers

Answer #1

rate = k [A]m[B]n   , k = rate constant , m = order w.r.t A , n = order w.r.t B

To determine order of the reaction w.r.t A , we will keep the concentration of B constant and vary [A]   

rate1 = k [A]1m[B]n ...1) for rate1 = 4.70X10-3   , [A]1 = 0.040M , [B] = 0.12M

rate2 = k [A]2m[B]n ....2)   for rate2 = 3.76X10-2 , [A]1 = 0.32M , [B] = 0.12M

Dividing 1 by 2

rate1 = k [A]1m[B]n (k and [B] will cancel out from numerator and denominator) rate2 = k [A]2m[B]n   

(4.70X10-3 )(3.76X10-2)   = ([A]1/[A]2)m = (0.040/0.32)m

0.125 = 0.125m

so, m = 1

Order of the reaction with respect to A is 1

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