Homework Help: chemistry

Posted by bob on Tuesday, April 6, 2010 at 4:39pm.

Strontium-90 has half-life of 28 years. if a 1.00-mg sample was stored for 112 years. what mass of Sr-90 would remain?

chemistry - DrBob222, Tuesday, April 6, 2010 at 5:06pm
k = 0.693/t_1/2

Substitute k in the following:
ln(No/N) = kt
No = 1 mg
N = mg remaining after t time
k from above.
t = 112 years.

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