a, \(n_{H_2}=\dfrac{3,36}{22,4}=0,15\left(mol\right)\)
PTHH: Fe + 2HCl → FeCl2 + H2
Mol: 0,15 0,15
PTHH: Fe2O3 + 6HCl → 2FeCl3 + 3H2O
Mol:
\(\%m_{Fe}=\dfrac{0,15.56.100\%}{24,4}=34,43\%;\%m_{Fe_2O_3}=100-34,43=65,57\%\)
\(n_{H2}=\dfrac{3,36}{22,4}=0,15\left(mol\right)\)
Pt : \(Fe+2HCl\rightarrow FeCl_2+H_2|\)
1 2 1 1
0,15 0,3 0,15
\(Fe_2O_3+6HCl\rightarrow2FeCl_3+3H_2O|\)
1 6 2 3
0,1 0,6
a) \(n_{Fe}=\dfrac{0,15.1}{1}=0,15\left(mol\right)\)
\(m_{Fe}=0,15.56=8,4\left(g\right)\)
\(m_{Fe2O3}=24,4-8,4=16\left(g\right)\)
0/0Fe2O3 = \(\dfrac{16.100}{24,4}=65,57\)0/0
b) Có : \(m_{Fe2O3}=16\left(g\right)\)
\(n_{Fe2O3}=\dfrac{16}{160}=0,1\left(mol\right)\)
\(n_{HCl\left(tổng\right)}=0,3+0,6=0,9\left(mol\right)\)
⇒ \(m_{HCl}=0,9.36,5=32,85\left(g\right)\)
\(m_{ddHCl}=\dfrac{32,85.100}{14,6}=225\left(g\right)\)
c) \(m_{ct}=\dfrac{8,4.600}{100}=50,4\left(g\right)\)
\(R\left(OH\right)_n+nHCl\rightarrow RCl_n+nH_2O|\)
\(n_{R\left(OH\right)n}=n_{HCl}=0,9\left(mol\right)\)
Có : 0,9.(R + 17) = 50,4
⇒ R + 17 = \(\dfrac{50,4}{0.9}=56\)
⇒ R = 56- 17 = 39 (dvc)
Vậy R là kali
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