Giúp chọn hệ số cân bằng pư

Em tham khảo nha:

\(\begin{array}{l}
9)\,2Fe{(OH)_3} \xrightarrow{t^0} F{e_2}{O_3} + 3{H_2}O\\
10)\,Fe{(OH)_3} + 3HCl \to FeC{l_3} + 3{H_2}O\\
11)\,CaC{l_2} + 2AgN{O_3} \to Ca{(N{O_3})_2} + 2AgCl\\
12)\,4P + 5{O_2} \xrightarrow{t^0}2{P_2}{O_5}\\
13)\,BaC{l_2} + {H_2}S{O_4} \to BaS{O_4} + 2HCl\\
14)\,Zn + 2HCl \to ZnC{l_2} + {H_2}\\
15)\,2Al + 3CuC{l_2} \to 2AlC{l_3} + 3Cu\\
16)\,C{O_2} + Ca{(OH)_2} \to CaC{O_3} + {H_2}O\\

\end{array}\)