Question

In a series of experiments summarised in the table below, the initial concentrations of reactants A...

In a series of experiments summarised in the table below, the initial concentrations of reactants A and B are varied and the initial rate determined (concentrations are in units of M and the rates in M s -1). Select the correct rate law for the reaction.

Experiment

Initial [A]

Initial [B]

Initial Rate

1

0.15

0.12

0.10

2

0.15

0.24

0.40

3

0.45

0.24

0.40
A.

R = k[B]
B.

R = k[A][B]
C.

R = k[B]2
D.

R = k[A]
E.

R = k[A]2
F.

R = k[A]2[B]
G.

R = k[A][B]2
Engineering   Chemical-Engineering   
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Homework Answers

Answer #1

Answer is C

In order to determine the correct rate law for the reaction, we need to find the equation for which the value of K satisfies for each experimental data.

Rate = k * Product of concentration

Therefore, K = Rate / (Product of concentration)

Try this for every rate law. Equation for which K is same in all 3 cases is the answer.

In case of Option C, R = k [B]^2

Therefore k = Rate/([B]^2)

1) k = 0.1/(0.12)^2 = 125/18

2) k = 0.4 / (0.24)^2 = 125/18

3) k =  0.4 / (0.24)^2 = 125/18

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