Sr-90 has a half-life of T1/2 = 2.85 a (years). How much Sr-90 will remain in a 5.00 g sample after 5.00 a? Show all of your work. (2 marks)

1.48 g

Explanation:

A = A₀ (½) ^ (t / T)

where A is the final amount,

A₀ is the initial amount,

t is time,

and T is the half life.

A = (5.00 g) (½) ^ (5.00 a / 2.85 a)

A = 1.48 g