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manzk1k
manzk1k manzk1k
  • 16-01-2017
  • Chemistry
Answered

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?

Verified Answer :

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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