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22 March, 06:53

The half-life of sodium-22 is 2.6 years. A sample contains 800 mg of this isotope.

Which expression represents the mass of sodium remaining after h half-lives?

A. S = 0.5 (800) ^h

B. S = 800^ (0.5) h

C. S = 800^0.5h

D. S = 800^h + 0.5

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Answers (1)
  1. 22 March, 07:13
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    The half life formula is given by:

    N (t) = N (1/2) ^h

    where:

    N (t) = S=final amount

    N=initial amount=800 mg

    h=half lives

    thus substituting our values we obtain

    S=800 (0.5) ^h

    The answer is C]
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