Question

how many moles of cao are needed to react with excess water to produce 370 grams of calcium hydroxide

Answer 1

What is cao? You won't get far in chemistry unless you find and use the caps key. Note that CO, Co, and co are different.

Do you mean CaO?
CaO + H2O ==> Ca(OH)2
mols Ca(OH)2 = grams/molar mass = ?
mols CaO = mols Ca(OH)2

Answer 2

i don't answer you

Answer 3

6.6 moles