manzk1k manzk1k

17-01-2017
Chemistry

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If the half-life of the pesticide is 12 years
What fraction of the pesticide will be left after 36 years? 100 years?
How many years will it take fir for 99.9% of the pesticide to decompose?

Respuesta :

andriansp andriansp

23-01-2017

k = 0.058 yr (constant)

Fraction of the pesticide = 36 years/12 = 3 half-lives , so around 1/8 left

when 99.9 % decomposed, 0.1 % is left , so the fraction is 0.001. To reach this point, it will take around +/- 120 years

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