Please help! Thank you Map Sapling Learning macmillan learning A reactant decomp

Question

Please help! Thank you

Map Sapling Learning macmillan learning A reactant decomposes with a half-life of 149 s when its initial concentration is 0.144 M. When the initial concentration is 0.756 M, this same reactant decomposes with the same half-life of 149 s What is the order of the reaction? Incorrect Notice that the half-life remains constant Which half-life equation shows an independent relationship between [Alo and t/2? 1 2 What is the value and unit of the rate constant for this reaction? Number zero order: 1/2 2k k = 11.0466 In(2) first order:11/2 second order:

Explanation / Answer

1)

since half life is independent of concentration that is since half life is constant, it is 1st order reaction.

Answer: 1

2)

we have:

Half life = 149 s

use relation between rate constant and half life of 1st order reaction

k = (ln 2) / k

= 0.693/(half life)

= 0.693/(149)

= 4.65*10^-3 s-1

Answer: 4.65*10^-3 s-1

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