The half-life of Rn-222 is 3.823 days....?
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Answer:
7.646 / 3.823 = 2 (this is the number of half-lives elapsed) (1/2)^2 = 0.25 (this is the decimal amount which remains after 2 half-lives) 0.0500 / 0.25 = 0.200 g (the starting amount)
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7.646 / 3.823 = 2 (this is the number of half-lives elapsed) (1/2)^2 = 0.25 (this is the decimal amount which remains after 2 half-lives) 0.0500 / 0.25 = 0.200 g (the starting amount)
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