Question

To find how much of a substance is left over, can I always use

(Initial mass) x (1/2)^# of half lives

?

Answer 1

\[m \times (\frac{ 1 }{ 2 }) ^{n}\]

Will this always work to find the mass left over after n number of half lives?

Answer 2

To find how much of a substance is left over after what ???

Answer 3

number of half lives that occur within a specified time period, for example:

If a substance has a half life of 30 minutes and 2 hours passed, 4 half lives occured.