The half-life of Palladium-100 is 4 days. After 16 days a sample of Palladium-100 has been reduced to a mass of 6 mg.

Question

What was the initial mass (in mg) of the sample?

What is the mass 8 weeks after the start? 

Answer 1

6=P(1/2)^(16/4)

6=P(1/2)^4

6=P(0.0625)

P=6/0.0625

P=96 mg

A=96(1/2)^(56/4)

A=96(1/2)^14

A=96(0.00006103515625)

A=0.005859375 mg