The half-life of calcium-47 about 5 days. Starting with 64

bedblogi38am

bedblogi38am

Answered question

2022-05-15

The half-life of calcium-47 about 5 days. Starting with 64 g of this isotope, what would be the amount remaining after 20 days?

Answer & Explanation

kazneni3tr2b

kazneni3tr2b

Beginner2022-05-16Added 17 answers

Divide 64 by 2 four times, because there are four half-lives in 20 days.
Every half-life, the calcium-47 will lose half of the amount remaining.
20   d a y s 5   d a y s / h a l f l i f e = 4 half-lives.
64 g 2 = 32 g after 1 half-life
32 g 2 = 16 g after 2 half-lives
16 g 2 = 8 g after 3 half-lives
8 g 2 = 4 g after 4 half-lives.

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