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.

____yr

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)

k=____min^-1

b)How long does it take for 83.0% of the compound to decompose? (round to one decimal place)

t=____min

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