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Search Textbook Solutions | Chegg.com Yahoo Search - Web Search Jump to... uestion 4 of 15 A particular reactant decomposes with a half-life of 151 s when its initial concentration is 0.335 M. The same reactant decomposes with a half-life of 211 s when its initial concentration is 0.240 M. Determine the reaction order. O O What is the value and unit of the rate constant for this reaction? Number k= Select answer O Previous. Give Up & View Solution @ Check Answer O Next Exit about us | careers | privacy policy 1 terms of use contact us help DISEO - B FT NO 0 A 0 (B) = E *, 80, 8 . ""AM EEEEEE|

Explanation / Answer

for 0 order reaction, half life increases with increasing initial concentration

for 2nd order reaction, half life decreases with increasing initial concentration which is the case here. So, it is 2nd order reaction

for 1st order reaction, half life is independent of initial concentration

Given:
Half life = 151 s
use relation between rate constant and half life of 2nd order reaction

k = 1/([A]o*half life)
= 1/(0.335*151)
= 1.977*10^-2 M-1.s-1
Answer:
2
k = 1.98*10^-2 M-1.s-1

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