Question

The half-life of Palladium-100 is 4 days. After 24 days a sample of Palladium-100 has been reduced to a mass of 1 mg. What was the initial mass (in mg) of the sample?

Answer 1

A is amount of substance. A0 is initial amount of substance. t is time. (Can't find the sign on keyboard) is half life.

A = A0(1/2)^(t/4)

A is given to us as 1, t is 24 and we are trying to find A0.

1 = A0(0.5)^6
1 = A0(0.015625)
A0 = 64g