Problem: Radioactive copper-64 decays with a half-life of 12.8 days.b. A sample contains 28.0 mg 64Cu. How many decay events will be produced in the first second? Assume the atomic mass of 64Cu is 64.0 u.

$N_{o} = 28 mg (\frac{10^{- 3} g}{1 mg}) (\frac{1 mol Cu}{64 g Cu}) (\frac{6.022 \times 10^{23} Cu atoms}{1 mol Cu}) =$ 2.635×10²⁰

81% (132 ratings)

Radioactive copper-64 decays with a half-life of 12.8 days.

b. A sample contains 28.0 mg ⁶⁴Cu. How many decay events will be produced in the first second? Assume the atomic mass of ⁶⁴Cu is 64.0 u.

What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the First Order Half Life concept. You can view video lessons to learn First Order Half Life. Or if you need more First Order Half Life practice, you can also practice First Order Half Life practice problems.

What textbook is this problem found in?

Our data indicates that this problem or a close variation was asked in Chemistry: An Atoms First Approach - Zumdahl Atoms 1st 2nd Edition. You can also practice Chemistry: An Atoms First Approach - Zumdahl Atoms 1st 2nd Edition practice problems.