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Worksheet: Using the Integrated Rate Law for First-Order Reactions

Q1:

The decomposition of cyclobutane is a first-order reaction with a rate constant of 9 . 2 0 Γ— 1 0 βˆ’ 3 sβˆ’1 at 5 0 0 ∘ C . Calculate, to 2 significant figures, the time taken for 80.0% of a sample of cyclobutane to decompose.

Q2:

Iodine-131 decays by 𝛽 emission with a rate constant of 0.138 dβˆ’1: Calculate, to 2 significant figures, the time taken for 90.0% of a sample of iodine-131 to decay.