ma-CHEM 1415- Fall17-YANG Activities and Due Dates HW-14 12/1/2017 11:55 PM 3/5

Question

ma-CHEM 1415- Fall17-YANG Activities and Due Dates HW-14 12/1/2017 11:55 PM 3/5 11/29/2017 10:03 PM Print Calculator Periodic Table uestion 22 of 28 Sapling Learning A particular reactant decomposes with a half-life of 125 s when its initial concentration is 0.314 M The same reactant decomposes with a half-life of 239 s when its initial concentration is 0.164 M Determine the reaction order What is the value and unit of the rate constant for this reaction? Number k- Select answer Previous Check Answer Next

Explanation / Answer

From the given data,

using second order half-life relation,

rate constant k = t/(Ao)(t1/2)

t1/2 = half-lfe

Ao = initial concentration of reactant

so,

when Ao = 0.314 M

t1/2 = 125s

k = 1/0.314 x 125 = 0.0255 M-1.s-1

when Ao = 0.164 M

t1/2 = 239s

k = 1/0.164 x 239 = 0.0255 M-1.s-1

So the order of the reaction is,

2

the rate constant k would be,

k = 0.0255 M-1.s-1

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