Chemistry: I need a bf...any takers

I need a bf...any takers - id12463999, Queenhagar

jessicahanshew99

28.12.2022

15.625 g of a 500 gram sample of potassium-42 with 12.4 hours of Half -life is left after 62 hours.

The half-life is the time after which half of the initial quantity of a radioactive substance is left .

Given here,

The half-life of K-42 = 12.4 hours

The initial quantity of K-42 = 500 gm

The final quantity after 62 hours = ?

The number of half cycle

$\bold { = 62\times \dfrac 1{12.4} = 5,}$

Thus the number of half life cycles in 62 hours is 5,

After 1 half life $\bold {= \dfrac {500}{2} = 250}$

After 2 half lives $\bold {= \dfrac {250}{2} = 125}$

After 3 half lives $\bold {= \dfrac {125}{2} = 62.5}$

After 4 half lives $\bold {= \dfrac {62.5}{2} = 31.25}\\$

After 5 half lives $\bold {= \dfrac {31.25}{2} = 12.625}\\$

15.625 g of a 500 gram sample of potassium-42 with 12.4 hours of Half -life is left after 62 hours.

To know more about Half life,

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