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In this lesson, we will learn how to use the integrated rate law for a first-order reaction to calculate the rate constant and initial concentration.
The decomposition of cyclobutane is a first-order reaction with a rate constant of
. Calculate, to 2 significant figures, the time taken for 80.0% of a sample of cyclobutane to decompose.
Iodine-131 decays by
emission with a rate constant of 0.138 d−1:
Calculate, to 2 significant figures, the time taken for 90.0% of a sample of iodine-131 to decay.
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