\(n_{Al}=\frac{8,1}{27}=0,3\left(mol\right)\)
\(n_{HCl}=0,3.2=0,6\left(mol\right)\)
\(Al+3HCl\rightarrow AlCl_3+\frac{3}{2}H_2\)
Vì nHCl < 3nAl \(\Rightarrow\) Al dư
\(\Rightarrow n_{H2}=\frac{1}{2}n_{HCl}=0,3\left(mol\right)\Rightarrow V_{H2}=0,3.22,4=6,72\left(l\right)\)
\(n_{AlCl3}=\frac{1}{2}n_{HCl}=0,2\left(mol\right)\)
\(\Rightarrow m_{AlCl3}=0,2.\left(27+35,5.3\right)=26,7\left(g\right)\)
\(CuO+H_2\rightarrow Cu+H_2O\)
Ta có: \(n_{Cu}=\frac{18,24}{64}=0,285\left(mol\right)=n_{H2_{pu}}\)
\(\Rightarrow H=\frac{0,285}{0,3}=95\%\)
nAl=8,1/27=0,3(mol)
nHCl=0,3*2=0,6(mol)
PTHH: \(2Al+6HCl\rightarrow2AlCl_3+3H_2\) (1)
ban đầu: 0,3___0,6
phản ứng:0,2<--0,6
dư:______0,1__0_____-->0,2______0,3___(mol)
a) VH2= 0,3*22,4=6,72(l)
b) mAlCl3=0,2*(27+35,5*3)=26,7(g)
c)
\(CuO+H_2\underrightarrow{t\text{°}}Cu+H_2O\) (2)
0,3<-----0,3--->0,3_______(mol)
mCu sinh ra (lý thuyết)=0,3*64=19,2 (g)
H=mCu sinh ra(thực tế)/mCu sinh ra (lý thuyết)*100=18,24/19,2*100=95%