Giải thích các bước giải:

\begin{array}{|c|c|c|}\hline \text{CTPT}&\text{Hợp chất}&\text{Tên gọi}&\text{Phân tử khối}\\\hline \text{9. }HNO_3&\text{Axit}&\text{Axit nitric}&\text{63 đvC}\\\hline \text{10. HCl}&\text{Axit}&\text{Axit clohidric}&\text{36,5 đvC}\\\hline \text{11. }CuSO_4&\text{Muối}&\text{Đồng (II) sunfat}&\text{160 đvC}\\\hline \text{12. }Fe_2O_3&\text{Oxit}&\text{Sắt (III) oxit}&\text{160 đvC}\\\hline \text{13. }H_3PO_4&\text{Axit}&\text{Axit photphoric}&\text{98 đvC}\\\hline \text{14. }Na_2O&\text{Oxit}&\text{Natri oxit}&\text{62 đvC}\\\hline \text{15. }Al(OH)_3&\text{Bazơ}&\text{Nhôm hidroxit}&\text{78 đvC}\\\hline \text{16. }KCl&\text{Muối}&\text{Kali clorua}&\text{74,5 đvC}\\\hline \text{17. }CaCO_3&\text{Muối}&\text{Canxi cacbonat}&\text{100 đvC}\\\hline \text{18. }MgCO_3&\text{Muối}&\text{Magie cacbonat}&\text{84 đvC}\\\hline \text{19. }H_3PO_4&\text{Axit}&\text{Axit photphoric}&\text{98 đvC}\\\hline \text{20. }Ba(OH)_2&\text{Bazơ}&\text{Bari hidroxit}&\text{171 đvC}\\\hline \text{21. ZnS}&\text{Muối}&\text{Kẽm sunfua}&\text{97 đvC}\\\hline \text{22. }N_2O_5&\text{Oxit}&\text{Đinitơ pentaoxit}&\text{108 đvC}\\\hline \text{23. }H_2SO_3&\text{Axit}&\text{Axit sunfurơ}&\text{82 đvC}\\\hline \text{24. }Mg(OH)_2&\text{Bazơ}&\text{Magie hidroxit}&\text{58 đvC}\\\hline \text{25. }CuSO_4&\text{Muối}&\text{ĐỒng (II) sunfat}&\text{160 đvC}\\\hline \text{26. }MgSO_3&\text{Muối}&\text{Magie sunfit}&\text{104 đvC}\\\hline \text{27. }NaCl&\text{Muối}&\text{Natri clorua}&\text{58,5 đvC}\\\hline \text{28. }Fe_2O_3&\text{Oxit}&\text{Sắt (II) oxit}&\text{160 đvC}\\\hline\end{array}

$HNO_{3}$ - axit-Axit nitoric - 63 \\
HCl - axit - axit clohidrc - 36,5 \\
$CuSO_{4}$ - muối - đồng(II) sunfat - 160 \\
$Fe_{2}O_{3} $ - oxit - sắt(III) oxit - 160 \\
$H_{3}PO_{4}$ -axit -  axit photphoric - 98 \\
$Na_{2}O$ - oxit - natri oxit - 62 \\
$Al(OH)_{3}$ - bazo - nhôm hidroxit - 78 \\
KCl - muối - kali clorua - 74,5 \\
$CaCO_{3}$ - muối -canxi cacbonat - 100 \\
$MgCO_{3}$- muối - magie cacbonat - 84 \\
$H_{3}PO_{4}$ -axit -  axit photphoric - 98 \\
$Ba(OH)_{2}$ - bazo - bari hidroxit - 171 \\
$ZnSO_{3}$ - muối - kẽm sunfua - 145 \\
$N_{2}O_{5}$ - oxit - đinitơ pentaoxit - 108 \\
$H_{2}SO_{3} $- axit - axit sunfuro - 82 \\
$Mg(OH)_{2} $ - bazơ - magie hidroxit - 58 \\
$CuSO_{4}$ - muối - đồng(II) sunfat - 160 \\
$MgSO_{3}$ -muối-  magie sunfit - 104 \\
NaCl - muối - natri clorua - 58,5 \\
FeO - oxit - sắt(II) oxit - 72