balance the equation:(i can balance the equation but the problem i have is finding the formula for the last part

HC2H3O2(aq) + Ca(OH)2(aq) -> H2O(l) + find the formula here

the last part would be CaOC2H3O2?

im a little confused. did the O fromt he H2O come from (OH)2?

No. the acetate ion C2H3O2- joins the calcium+2 ion to make calcium acetate

Ca(C2H3O2)2