16. A. B. C. D. E. The rate constant for the reaction 3A 4B is 6.00 x 10L mol minHow long will it take the concentra...

Question

Question

16. A. B. C. D. E. The rate constant for the reaction 3A 4B is 6.00 x 10L mol minHow long will it take the concentration of A

Answer 1

Answer #1

Look at the unit of rate constant.

It is L.mol-1.min-1 which is M-1.min-1

This is unit of k for 2nd order reaction.

So, order of reaction is 2

we have:

[A]o = 0.75 M

[A] = 0.25 M

k = 6.00*10^-3 M-1.min-1

use integrated rate law for 2nd order reaction

1/[A] = 1/[A]o + k*t

1/(0.25) = 1/(0.75) + 6*10^-3*t

4 = 1.333 +6.00*10^-3*t

6.00*10^-3*t = 2.667

t = 4.40*10^2 min

= 440 min

Answer: D

Answer 2

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