JaylynnBenally9495 JaylynnBenally9495

04-02-2022
Chemistry

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The half-life of radon gas is approximately four days. Four weeks after the introduction of radon into a sealed room, the fraction of the original amount remaining is closest to

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Eduard22sly Eduard22sly

16-02-2022

The fraction of the original amount remaining is closest to 1/128

Determination of the number of half-lives

Half-life (t½) = 4 days
Time (t) = 4 weeks = 4 × 7 = 28 days
Number of half-lives (n) =?

n = t / t½

n = 28 / 4

n = 7

How to determine the amount remaining

Original amount (N₀) = 100 g
Number of half-lives (n) = 7
Amount remaining (N)=?

N = N₀ / 2ⁿ

N = 100 / 2⁷

N = 0.78125 g

How to determine the fraction remaining

Original amount (N₀) = 100 g
Amount remaining (N)= 0.78125 g

Fraction remaining =?

Fraction remaining = N / N₀

Fraction remaining = 0.78125 / 100

Fraction remaining = 1/128

Learn more about half life:

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