# Question #21f9a

##### 1 Answer

Oct 28, 2016

1.2 grams

#### Explanation:

Let n = the number of half lives

Let Q(n) = the quantity after n half lives.

Let Q(0) = the original quantity

The exponential decay is

when

This helps us to find the value of

Your conditions are Q(0) = 75.0 g and n = 6