# Technetium 99 is used for brain scans. If a laboratory receives a shipment of 178 g of this isotope, how much will remain after 15 hours? The half life of Technetium 99 is 6 hours.

##### 1 Answer

Jan 19, 2017

The answer is

#### Explanation:

We apply the law of dadioactive decay

The mass of Technetium 99 remaining after 15 h