# Question #df43a

Aug 27, 2017

9

#### Explanation:

calcium chlorate $C a {\left(C l {O}_{3}\right)}_{2}$ (be careful with your capitals)

one calcium atom (Ca)
Two chlorine atoms (Cl) (this is multiplied by the number outside of the bracket - it applies to everything inside the bracket (Cl and O)).
six oxygen atoms (O), or rather 2 molecules of $C l {O}_{3}$, each of which has 3 oxygen atoms.

1+2+6=9