Find the reactants for the following products:

Question

Reactants: Products: NH3(g) + CO2(g) + H2O(l)

Reactants: Products: ZnSO4(aq) + Cu(s)

Reactants: Products: CuO(s)

Reactants: Products: Na+1(aq) + CO3-2(aq)

Reactants: Products: SrCO3(s) + NaNO3(aq)

Answer 1

A strangely worded question. I really don't get the reactants:products: idea. If you want the reactants for the following in which ZnSO4(aq) + Cu(s) are the products, then Zn(s) + CuSO4(aq) ==> ZnSO4(aq) + Cu(s)
or
Sr(NO3)2(aq) + Na2CO3(aq) ==> SrCO3(s) + NaNO3(aq)
The first equation is balanced; the second one is not.