# Question 84c98

##### 1 Answer
Aug 24, 2017

$2$

#### Explanation:

The formula unit of calcium bicarbonate is "Ca"("HCO"_3)_2#.

This means that there are $2$ bicarbonate ions.

Since there is $1$ carbon atom per bicarbonate ion, there are $1 \times 2 = 2$ carbon atoms per formula unit.