Solve.

18=5/6m

A. 21 3/5

B. 17 1/6

C. 15

D. 3/5

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? S = 0.5 (800) h S = 800 (0.5) h S = 8000.5h S = 800h + 0.

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