- #1
runicle
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Something has a half-life of 18.4 days. How much time will a 50-mg sample take to decompose to 10 mg?
My steps
50(1/2)^n/18.4 = 10(1/2)^n/18.4
25^n/18.4 = 5^n/18.4
(5^2)^n/18.4 = 5^n/18.4
5^2n/18.4 = 5^n/18.4
Exponent view
2n/18.4 = n/18.4
2n-n = 18.4/18.4
n=1
Am i doing something wrong?
My steps
50(1/2)^n/18.4 = 10(1/2)^n/18.4
25^n/18.4 = 5^n/18.4
(5^2)^n/18.4 = 5^n/18.4
5^2n/18.4 = 5^n/18.4
Exponent view
2n/18.4 = n/18.4
2n-n = 18.4/18.4
n=1
Am i doing something wrong?