a, PTHH: \(Fe_2O_3+6HCl\rightarrow2FeCl_3+3H_2O\)
b. Ta có \(n_{Fe_2O_3}=\frac{16}{160}=0,1\) (mol)
Theo PTHH: \(n_{HCl}=6n_{Fe_2O_3}=6.0,1=0,6\) (mol)
=> \(m_{HCl}=0,6.36,5=21,9\) (g)
c, Theo PTHH: n FeCl3 = 0,2 (mol)
=> m FeCl3 = 0,2 . 162,5 =32,5 (g)
Áp dụng ĐLBTKL ta có:
\(m_{dd-sau-p.ư}=m_{Fe_2O_3}+m_{ddHCl}=16+248=264\left(g\right)\)
=> C% FeCl3 = \(\frac{32,5}{264}.100\%\approx12,31\%\)