posted by Candace on .
Naturally occurring cobalt consists of only one isotope Co59 whose relative atomic mass is 58.9332. A synthetic radioactive isotope of cobalt Co60, relative atomic mass 59.9338, is used in radiation therapy for cancer. A 1.8516 sample of cobalt has an apparent "atomic mass" of 58.9901.Find the mass Co60 of in this sample
solve for x, which is the decimal fraction of Co60, then multipy it by 1.8516 to get the mass of Co60
Let x = fraction of Co60; then
1-x = fraction of Co59.
mass Co59(1-x) + mass Co60(x) = 58.9901
Solve for x (and multiply by 100 if you want percent, then
fraction x 1.8516g = mass Co 60 in the 1.8616g sample.
When I worked it out I got .105 g, is that correct?
I have to get this question right, in order to make a B on my assignment