Asked by Sam

A decomposition reaction has a rate constant of 0.0019 yr -1.
(
a) What is the half-life of the reaction?
______ yr

(b) How long does it take for [reactant] to reach 12.5% of its original value?
______ yr
Answered by DrBob222
a)
k = 0.693/t<sub>1/2</sub>
Substitute and solve for t<sub>1/2</sub>

b)
ln(No/N) = kt
If you let No = 100, then N = 12.5; substitute k and solve for t in years.

Answered by sarai`
.0013167
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