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3 July, 04:16

If a 900.0-g sample of radium-226 decays to 225.0 g of radium-226 remaining in 3,200 years, what is the half-life of radium-226?

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  1. 3 July, 04:42
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    If the half-life of a 900.0 g sample of radium-226 is 3,200 years, then in 3,200 years only 450.0 g (half-life) of radium-226 remains. During the next 3,200 years, that is the time it decays to 225.0 g (next half-life).
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