Homework Help: chemistry

Posted by Monique on Saturday, November 26, 2011 at 11:38am.

A radioactive sample contains 2.45g of an isotope wiht a half life of 3.8 days. How much of the isotope in grams remains after 11.4 days?

please explain

chemistry - DrBob222, Saturday, November 26, 2011 at 12:58pm
k = 0.693/t_1/2
Solve for t_1/2 and substitute into the equation below.
ln(No/N) = kt
No = starting grams = 2.45 g
N = ending amount. Solve for this.
k = from above calculation.
t = 11.5 days.
chemistry - Anonymous, Thursday, March 7, 2013 at 6:03am
0.30625
chemistry - Anonymous, Thursday, March 7, 2013 at 6:03am
0.30625

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