Cho 31,9 gam hỗn hợp Al2

B

- Hướng dẫn giải

Đáp án B

$\begin{array}{l}+ Sơ đồ phản ứng\\ \\ \left\{\begin{array}{l}A{l}_2{O}_3, ZnO\\ FeO, CaO\end{array}\right\} \underset{t^o}{\overset{CO}{\to }}\left\{\begin{array}{l}C{O}_2\uparrow \\ \left\{\begin{array}{l}A{l}_2{O}_3, ZnO\\ Fe, CaO\end{array}\right\}\left\{\begin{array}{l}A{l}^{3+}, Z{n}^{2+}\\ F{e}^{2+}, C{a}^{2+}\end{array}\right\}+H_2\uparrow \end{array}\right. \\ \\ \Rightarrow Chất khử là CO, chất oxi hóa là HCl.\\ + \left\{\begin{array}{l}BCP¨O: n_{CO}=n_{O trong oxit pư }=\frac{31,9-28,7}{16}=0,2\\ BT E: 2n_{CO}=2n_{H_2}\end{array}\right.\Rightarrow \left\{\begin{array}{l}{n}_{H_2}=0,2\\ V_{H_2 (~nktc)}=4,48 lít\end{array}\right.\end{array}$