How much mass of radioactive isotope in 200 years?

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If the radioactive isotope is half- life of 100 years is 40 g isotope than how much mass in 200 yrs?

2007-03-28 11:38:16 · 2 answers · asked by krntigerchick_punk 2 in Science & Mathematics ➔ Chemistry

2 half-lives means half, then half of what is left.
So:

1/2
(1/2)*(1/2) =1/4

1/4 * 40 grams = 10 grams

2007-03-28 11:46:02 · answer #1 · answered by Jerry P 6 · 0⤊ 0⤋

10 g......

2007-03-28 18:41:19 · answer #2 · answered by Sophie 3 · 0⤊ 0⤋