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?

Question

Chemistry

Gustavo Hodges

21 April, 07:47

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?

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Answers (1)

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Duchess · Answer 1

Answer: 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.