The reaction a → products is first order. if the initial concentration of a is 0.646 m and, after 72.8 seconds have elapsed, the concentration of a has fallen to 0.0146 m, what is the rate constant of the reaction?

0.00867 moldm-3

Explanation:

Since the reaction is 1st order,

Rate of reaction=∆[A]÷t

0.646-0.0146/72.8= 0.00867

Remember that in a first order reaction, the rate of reaction depends on change in the concentration of only one of the reaction species, A in the problem above.

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