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13. t = 1183 min and 0.50 M.

14.

Explanation:

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13. In this case, according to the units, we infer this is a second-order reaction which has the following integrated rate law:

Which can be solved for the time as shown below:

Thus, we plug in the given concentrations and rate constant to obtain:

For the second part, we proceed by using the same rate constant and the new initial concentration as follows:

14. In this case, according to the units of the rate constant, we infer this is a zeroth-order reaction, therefore we compute the half-life has shown below:

Thus, we plug in to obtain:

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