Question #df43a

1 Answer
Aug 27, 2017

Answer:

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