Question

Question #df43a

Answer 1

9

Explanation:

calcium chlorate `Ca(ClO_3)_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 `ClO_3`, each of which has 3 oxygen atoms.

1+2+6=9