A reactant in a first-order chemical reaction without back reaction has a concentration governed by the same

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A reactant in a first-order chemical reaction without back reaction has a concentration governed by the same formula as radioactive decay,

[4], = [A], e¬k, –kt

where [A]0 is the concentration at time t = 0, [A]t is the concentration at time t, and k is a function of temperature called the rate constant. If k = 0.123 sˆ’1 find the time required for the concentration to drop to 21.0% of its initial value.

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