Homework Help: Chemistry

Posted by Matthew on Tuesday, December 11, 2012 at 10:57pm.

What is the half-life of a 100.0 g sample of nitrogen-16 that decays to 12.5 g of nitrogen-16 in 21.6 s? Please help me!!

Chemistry - DrBob222, Tuesday, December 11, 2012 at 11:10pm
ln(No/N) = kt
No = 100g
N = 12.5g
k = solve for this
t = 21.6 sec

Then Substitute k into
k = 0.693/t_1/2 and solve for t_1/2

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