Đáp án + Giải thích các bước giải:

$\begin{array}{|c|c|c|}\hline \text{STT}&\text{CTHH}&\text{KL mol (g/mol)}&\text{Phân loại}&\text{Tên}\\\hline \text{17}&Al(OH)_3&78&\rm Bazơ&\rm Nhôm\,hiđroxit\\\hline \text{18}&NaNO_2&69&\rm Muối&\rm Natri\,nitrit\\\hline \text{19}&H_2SO_4&98&\rm Axit&\rm Axit\,sunfuric\\\hline \text{20}&H_2SO_3&82&\rm Axit&\rm Axit\,sunfurơ\\\hline \text{21}&KH_2PO_4&136&\rm Muối&\rm Kali\,đihiđrophotphat\\\hline \text{22}&PbS&249&\rm Muối&\rm Chì\,(II)\,sunfua\\\hline \text{23}&AgBr&188&\rm Muối&\rm Bạc\,bromua\\\hline \text{24}&Ca(OH)_2&74&\rm Bazơ&\rm Canxi\,hiđroxit\\\hline \text{25}&BaSO_4&233&\rm Muối&\rm Bari\,sunfat\\\hline \text{26}&N_2O_3&76&\rm Oxit\,axit&\rm Đinitơ\,trioxit\\\hline\end{array}$

$Al(OH)_3$ - 78 - bazơ - Nhôm hiđroxit

$NaNO_2$ - 69 - muối - natri nitrơ

$H_2SO_4$ - 98 - axit - axit sunfuric

$H_2SO_3$ - 82 - axit - axit sunfurơ

$KH_2PO_4$ - 136 - muối - kali đihiđrophotphat

$PbS$ - 249 - muối - chì (II) sunfua

$AgBr$ - 188 - muối - bạc bromua

$Ca(OH)_2$ - 74 - bazơ - canxi hiđroxit

$BaSO_4$ - 233 - muối - bari sunfat

$N_2O_5$ - 108 - oxit axit - đinitơ pentaoxit