Chemistry
posted by Shay .
Po210 Ia an alpha emitter with a halflife of 138 days. how many grams of Po210 remain after 552 days if the sample initially contained 5.80g of Po210?

Chemistry 
Shay
Suppose that you start with 1000000 atoms of a particular radioactive isotope. how many halflives woruld be required to reduce the number of undecayed atoms to fewer than 1000?

Chemistry 
DrBob222
#1.
k = 0.693/t_{1/2}
Substitute k in the below equation.
ln(No/N) = kt
No = 5.80g
N = ?
K = from above
t = 552 days
Solve for N
For #2, you want 1,000,000/2^n = 1,000
Solve for n. The easy way to do that is to solve for 2^n and then n. 
Chemistry 
gunth
0.3625
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