1. A first-order decomposition reaction has a rate constant of 0.0056 yr^-1. How long does it take for [reactant] to reach 12.5% of its original value? Be sure to report your answer to the correct number of significant figures.
2. In a first-order decomposition reaction, 50.0% of a compound decomposes in 12.0 min.
a)What is the rate constant of the reaction? (round to four decimal places)
b)How long does it take for 83.0% of the compound to decompose? (round to one decimal place)