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 :

Question

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 : (A) 25 g (B) 50 g (C) 12.5 g (D) 6.25 g

Tardigrade Admin · Accepted Answer

C=C0((1/2))y y=( text total time / text half-life ) =3 =100((1/2))3=12.5 g

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 :

$25 g$

$50 g$

$12.5 g$

$6.25 g$

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

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

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

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

25g

50g

12.5g

6.25g