You are running the reaction: 2A + B -> C + 3D. Your lab partner has conducted t

Question

You are running the reaction: 2A + B -> C + 3D.

Your lab partner has conducted the first two experiments to determine the rate law for the reaction by the method of initial rates.

Expt. # Conc. of A (M) Conc. of B (M)

1 0.0250 0.0330

2 0.0500 0.0330

3

Presuming that you can measure the initial rate of each experiment, which of the following concentrations for Experiment 3 would help you to determine the rate law easily?

(a) [A] = 0.0330 M, [B] = 0.0330 M

(b) [A] = 0.0125 M, [B] = 0.0500 M

(c) [A] = 0.0250 M, [B] = 0.0400 M

(d) [A] = 0.0250 M, [B] = 0.0330 M

(e) [A] = 0.0500 M, [B] = 0.0330 M

Explanation / Answer

Option (C) is answer.

If you observe first two experiments carefully you can find that concentration of B is kept constant and concentration of A is changed (doubled). So measuring the initial rate will give us information on order of reaction with respect to A.

To find order of reaction with respect to B. The concentration of B has to be changed and concentration of A has to be constant.

So A should be either 0.0250 or 0.0500.

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