A reactant decomposes with a half-life of 129 129 s when its initial concentration is 0.131 0.131 M. When the initial concentration is 0.527 0.527 M, this same reactant decomposes with the same half-life of 129 129 s. What is the value and unit of the rate constant for this reaction? k = k = What is the order of the reaction?

Question

Chemistry

Romeo Acevedo

2 April, 16:42

A reactant decomposes with a half-life of 129 129 s when its initial concentration is 0.131 0.131 M. When the initial concentration is 0.527 0.527 M, this same reactant decomposes with the same half-life of 129 129 s. What is the value and unit of the rate constant for this reaction? k = k = What is the order of the reaction?

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Brenton Leach · Answer 1

Half life = 129s

Initial Concentration = 0.527M

Rate constant = ?

Order of reaction = ?

The half-life equation of a first-order reaction does not include a reactant concentration term. A half-life is independent of concentration and remains constant throughout the duration of the reaction.

Order of reaction = First Order

t1/2 = 0.693 / k; where k = rate constant

129 = 0.693 / k

k = 0.693 / 129 = 0.00537s-1