\(n_{Al}=\frac{8,1}{27}=0,3\left(mol\right);n_{HCl}=\frac{21,9}{36,5}=0,6\left(mol\right)\)
\(a.PTHH:2Al+6HCl\rightarrow2AlCl_3+3H_2\)
(mol)_______2______6________2______3_
(mol)_______0,2____0,6______0,2_____0,3_
b. Tỉ lệ: \(\frac{0,3}{2}>\frac{0,6}{6}\rightarrow\) Al dư 0,3 - 0,2 = 0,1 (mol)
\(\Rightarrow m_{Aldu}=0,1.27=2,7\left(g\right)\)
\(c.m_{AlCl_3}=0,2.98=19,6\left(g\right)\)
\(d.PTHH:CuO+H_2\underrightarrow{t^o}Cu+H_2O\)
(mol)______1______1___________
(mol)______0,3_____0,3______________
\(m_{CuO}=0,3.80=24\left(g\right)\)