10/
a/ \(n_{HCl}=\dfrac{58,4}{36,5}=1,6\left(mol\right)\)
PTHH: Fe + 2HCl → FeCl2 + H2
Mol: 1,6 0,8 0,8
\(m_{FeCl_2}=0,8.127=101,6\left(g\right)\)
b/ \(V_{H_2}=0,8.22,4=17,92\left(l\right)\)
11/
a/ \(n_{K_2CO_3}=\dfrac{20,7}{138}=0,15\left(mol\right)\)
\(m_{HCl}=91,25.8\%=7,3\left(g\right)\Rightarrow n_{HCl}=\dfrac{7,3}{36,5}=0,2\left(mol\right)\)
PTHH: K2CO3 + 2HCl → 2KCl + CO2 + H2O
Mol: 0,2 0,2 0,1
Ta có: \(\dfrac{0,15}{1}>\dfrac{0,2}{2}\) ⇒ K2CO3 dư, HCl hết
\(m_{KCl}=0,2.74,5=14,9\left(g\right)\)
b/ \(V_{CO_2}=0,1.22,4=2,24\left(l\right)\)