What is chemical formula of copper(ll) sulfide?

CuS

Formula for copper(ii)sulphide is CuSO3 (3 Being subscript)

how many molecules do you have in 64g of CO?

Well you have to divide 64g by the molar mass of CO (28.01) to find the moles of CO you have. Then you multiple the moles by 3.02*10^23 to find the molecules.

what is the name of this compound ba3po4?

mercury and bromine will react with each other to produce mercury bromide

hg+br2 =hgbr2
what mass of hgbr2 can be produced from the reaction of 10.0hg and 9.00g br2 what mass of what reagent is left un reacted

JaLeesa,

It's called Barium Phosphate.