Question

Initial Concentration mol/L[A] Initial Concentration mol/L[B] Initial Rate mol/Ls 0.20 0.10 20 0.20 0.20 40 0.40 0.20 160 Given the data in the accompanying table, what is the reaction order for A when comparing the second and third rows?

Answer 1

The answer should be C. second.

Answer 2

Answer: 2

Step-by-step explanation:

1) Table (given):

Initial Concentration mol/L Initial Concentration mol/ Initial Rate mol/Ls
[A] [B]

0.20 0.10 20
0.20 0.20 40
0.40 0.20 160

2) Procedure

i) Start assuming the form of the law: r = k [A]ᵃ [B]ᵇ

ii) Comparing row 2 with row 3, you infere that doubling the initial concentration of A and keeping the concentration of B constant, the speed of the reaction quadruples.

That means that the exponent a, or the order of reaction for the reactant A is 2.