Which rate indicates the number of children that would be born per woman if she were to live to the end of her child-bearing yea
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Via half-life equation we have:
Where the initial amount is 50 grams, half-life is 4 minutes, and time elapsed is 12 minutes. By plugging those values in we get:
There is 6.25 grams left of Ra-229 after 12 minutes.