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Vesnalui [34]
3 years ago
13

What is the radioactivity of the sample of sodium -24 after 30h?

Chemistry
2 answers:
exis [7]3 years ago
6 0

Answer:

25%

Explanation:

Sodium-24 is a radioactive isotope of Sodium, which has a half-life of 14.96 hours and undergoes β-decay and changes to a stable isotope Magnesium-24.

Now, considering the half-life of Sodium-24 for approximately 15 hours.

For the first half-life, it will decay 50% of its initial composition in the first 15 hours. So it will contain the remaining 50% of its amount.

Next, for the second half-life, it will decay another 50% of its composition in the next 15 hours. So the remaining composition will be half of 50% i.e. 25%.

Thus, after 30 hours, undergoing 2 half-lives, the remaining composition left is 25% of Sodium-24.

statuscvo [17]3 years ago
5 0
Half life is 15 hours
so 30 hours would be 2 half lives

after 15 hours it would be at 50%
after 15 more hours it would be at 50% of 50%

so .5 x .5 = .25

it would be 25%
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