Worksheet: Half-Lives from Reaction Data

In this worksheet, we will practice calculating half-lives of first- and second-order reactions from measurements of concentration over time.

Q1:

Compound A spontaneously decomposes in solution. At the beginning of the reaction, compound A has a concentration of 0.2330 M and a half-life of 11.98 min. The concentration of A after a time 𝑇 is 0.0870 M.

If the decomposition of A is a first-order reaction, what is the value of 𝑇, to 3 significant figures?

If the decomposition of A is a second-order reaction, what is the value of 𝑇, to 3 significant figures?

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