16.94/18=.9411111
sig figs: 0.9411 mole of water
Answer:
6 moles of oxygen, or 3O2.
Explanation:
I would build a proportion for this:

<span>Ca has 2 valence electrons and F has 7, they would end up having to share electrons but Ca or F has to keep one because in total there are 9 valence elections and only 8 are needed to make this pair "happy". that's all i can provide. i hope it helped some</span>