Question

A 25 gram sample of a substance that's used for drug research has a k-value of 0.1229 Find the substance's half-life in days.

Answer 1

The formula for half life is:\[\frac{1}{2}N_0=N_oe^{-kt}\]Which can be simplified to:\[t=\frac{-ln(2)}{-k}\]Plug in k to get:\[t=\frac{-ln(2)}{-0.1229}=5.64\]

Answer 2

bit late but awesome response