Question

You are given 500 grams of a substance with a half-life of 1.5 years. How much will remain after 15.0 years?

Answer 1

`0.488` grams

Explanation:

`15.0` years is `10` times the half life, so the amount of the substance remaining will be:

`(500"g")/2^10 = (500"g")/1024 ~~ 0.488"g"`