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?

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?

#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.
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