\(n_{Al}=\dfrac{5,4}{27}=0,2\left(mol\right)\)
PTHH:
\(2Al+6HCl\rightarrow2AlCl_3+3H_2\uparrow\)
0,2 0,2 0,3
\(V_{H_2}=n.22,4=6,72\left(l\right)\)
\(m_{AlCl_3}=n.M=0,2.133,5=26,7\left(g\right)\)
a) \(2Al+6HCl\rightarrow2AlCl_3+3H_2\)
b) \(n_{Al}=\dfrac{m}{M}=\dfrac{5,4}{27}=0,2\left(mol\right)\) ; \(n_{HCl}=\dfrac{m}{M}=\dfrac{18,25}{36,5}=0,5\left(mol\right)\)
\(2Al\) \(+\) \(6HCl\) → \(2AlCl_3\) \(+\) \(3H_2\)
Tỉ lệ: \(\dfrac{0,2}{2}>\dfrac{0,5}{6}\) ⇒ Al dư, tính theo HCl
\(2Al+6HCl\rightarrow2AlCl_3+3H_2\)
\(0,5\) → \(\dfrac{1}{6}\) → \(0,25\) ( mol )
\(V_{H_2}=n.22,4=0,25.22,4=5,6\left(l\right)\)
c) \(m_{AlCl_3}=n.M=\dfrac{1}{6}.\left(27+35,5.3\right)=22,25\left(g\right)\)