There are 2.3 moles (because of significant figures)
The name of the compound Na2SO4 is:
nitrogen sulfite
nitrogen sulfide
sodium sulfate
sodium sulfite
nickel sulfide
sodium sulfate
The formula of calcium phosphate is:
CaPO4
CaP
Ca3(PO4)2
Ca4(PO4)3
Ca(PO4)2
Ca3(PO4)2
The formula for calcium acetate is:
Ca2C2H3O2
CaC2O4
Ca(C2O4)2
Ca(C2H3O2)2
CaC2H3O2
Ca(C2H3O2)2
Explanation:
to find POH u need PH first
so ph=-log(h3o)
so

I think the answer is A. Hope that helped :)