Question

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

Answer 1

B

Explanation:

took the quiz

Answer 2

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]