Em tham khảo nha:
\(\begin{array}{l}
a)\\
\,CTHH:{O_3}\\
{M_{{O_3}}} = 3 \times 16 = 48\,dvC\\
b)\\
CTHH:N{H_3}\\
{M_{N{H_3}}} = 14 + 1 \times 3 = 17\,dvC\\
c)\\
CTHH:Fe{(OH)_3}\\
{M_{Fe{{(OH)}_3}}} = 56 + (16 + 1) \times 3 = 107\,dvC\\
d)\\
CTHH:N{a_2}C{O_3}\\
{M_{N{a_2}C{O_3}}} = 23 \times 2 + 12 + 16 \times 3 = 106\,dvC\\
e)\\
CTHH:A{l_2}{(S{O_4})_3}\\
{M_{A{l_2}{{(S{O_4})}_3}}} = 27 \times 2 + (32 + 16 \times 4) \times 3 = 342\,dvC
\end{array}\)
