carolynalee carolynalee

26-05-2017
Chemistry

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A sample of radium-226 contains 1.0×108 atoms of radium-226. How many atoms of radium-226 will remain in the sample after three half-lives?

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apologiabiology apologiabiology

26-05-2017

after 3 half lives it will be (1/2)^3 or 1/8 of original

so
1/8 times 10^8=1.25 x 10⁶ atoms left

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