The half-life of Palladium-100 is 4 days. After 20 days a

Last updated: 7/15/2022

The half-life of Palladium-100 is 4 days. After 20 days a sample of Palladium-100 has been reduced to a mass of 5 mg. What was the initial mass (in mg) of the sample? What is the mass 7 weeks after the start?