2Al +6 HCl------>2AlCl3 + 3H2
Ta có
n\(_{Al}=\frac{0,54}{27}=0,02\left(mol\right)\)
Theo pthh
n\(_{HCl}=3n_{Al}=0,06\left(mol\right)\)
m\(_{HCl}=0,06.36,5=2,19\left(g\right)\)
mddHCl =\(\frac{2,19.100}{20}=10,95\left(g\right)\)
Theo pthh
n\(_{H2}=\frac{3}{2}n_{Al}=0,03\left(mol\right)\)
m\(_{H2}=0,03.2=0,06\left(g\right)\)
mdd sau pư=10,95 + 0,54-0,06=11,43(g)
Theo pthh
n\(_{AlCl3}=n_{Al}=0,02\left(mol\right)\)
m\(_{AlCl3}=0,02.133,5=2,67\left(g\right)\)
C%=\(\frac{2,67}{11,43}.100\%=23,36\%\)
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