Asked by Sanjay

Which radioactive sample would contain the greatest remaining mass of the radioactive isotope after 10 years?
A. 2.0 grams of 198 Au
B. 2.0 grams of 42 K
C. 4.0 grams of 32 P
D. 4.0 grams of 60 Co

By the way the numbers next to the elements are their atomic masses. thanks again

You must look up the half-life of each of the isotopes. Surely you have a text or notes that will furnish this. Co-60 is the only one I know from memory for I worked with it many years ago. It is 5.1 years half-life. Then half of the mass will remain after 1 half life, 1/4 will remain after two half lives, etc.
You can also use
ln(No/N)=kt I can help with that if you need help after you obtain the half lives.
Answered by Anonymous
It is D
4.0 grams of 60Co
Answered by Anonymous
It is choice (D)
4.0 grams of 60Co
Answered by Mr. Hojman
Plz dont cheat! Just learn!
Answered by Mr. Hojman
It will help you in the long run...
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