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  3. Chemistry
  4. Half-life of a substance A following first order kinetics is 5 days. Starting with 100 g of A, amount left after 15 days is :

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Q. Half-life of a substance $A$ following first order kinetics is 5 days. Starting with $100 g$ of $A$, amount left after 15 days is :

AIEEEAIEEE 2002

Solution:

$C=C_{0}\left(\frac{1}{2}\right)^{y} $

$ y=\frac{\text { total time }}{\text { half-life }} =3 $

$=100\left(\frac{1}{2}\right)^{3}=12.5 g $