The reaction, S2O82-(aq) + 3 I-(aq) 2 SO42-(aq) + I3-(aq), was studied at a cert

Question

The reaction, S2O82-(aq) + 3 I-(aq) 2 SO42-(aq) + I3-(aq), was studied at a certain temperature with the following results:

Experiment [S2O82-(aq)] (M) [I-(aq)] (M) Rate (M/s)
1 0.0392 0.0392 7.08e-06
2 0.0392 0.0784 1.42e-05
3 0.0784 0.0392 1.42e-05
4 0.0784 0.0784 2.83e-05

If the rate law for this reaction is, Rate = k [S2O82-(aq)] [I-(aq)], what is the value of the rate constant?



a) The value of rate constant is k = 1.43e-01 M-1 s-1.
b) The value of rate constant is k = 7.39e-04 M-1 s-1.
c) The value of rate constant is k = 1.57e-03 M-1 s-1.
d) The value of rate constant is k = 3.53e-02 M-1 s-1.
e) The value of rate constant is k = 4.61e-03 M-1 s-1.

Explanation / Answer

e) The value of rate constant is k = 4.61e-03 M-1 s-1. Plug in the concentrations and rate from any one of the 4 experiments into the rate law. Take experiment 1: rate = 7.08e-06 = k[0.0392][0.0392] ==> k = 0.00461 = 4.61e-03 M-1 s-1

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