The half-life of Palladium-100 is 4 days. After 12 days a sample of Palladium-100 has been reduced to a mass of 2 mg.

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

What is the mass 5 weeks after the start?

Guest Mar 9, 2021

#1**+1 **

12 days is 3 half lives

2 --------- 4 --------- 8 -------- 16 mg initially

5 weeks = 5 x 7 = 35 days 35 days / 4days/half life = 8.75 half lifes

16 mg (1/2)^{8.75 }= .03716 mg

ElectricPavlov Mar 9, 2021