PTHH: \(2Al+6HCl\rightarrow2AlCl_3+3H_2\\ 0,1mol:0,3mol\rightarrow0,1mol:0,15mol\)
\(n_{Al}=\dfrac{2,7}{27}=0,1\left(mol\right)\)
\(n_{HCl}=\dfrac{32,85}{36,5}=0,9\left(mol\right)\)
Ta có tỉ lệ: \(\dfrac{n_{Al}}{2}=\dfrac{0,1}{2}< \dfrac{n_{HCl}}{6}=\dfrac{0,9}{6}\)
a. Vậy HCl phản ứng dư, Al phản ứng hết.
\(n_{HCldu}=0,9-0,3=0,6\left(mol\right)\)
\(m_{HCldu}=0,6.36,5=21,9\left(g\right)\)
b. \(m_{AlCl_3}=0,1.133,5=13,35\left(g\right)\)
PTHH: \(Fe_3O_4+4H_2\rightarrow3Fe+4H_2O\\ 0,24mol:0,96mol\rightarrow0,72mol:0,96mol\)
\(n_{H_2pu}=0,3.80\%=0,24\left(mol\right)\)
\(m_{Fe}=0,72.56=40,32\left(g\right)\)