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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