Question

Giải chi tiết giúp e cảm ơn anh chị

Answer 1

a) Gọi số mol Fe, Zn là a, b (mol)

=> 56a + 65b = 12,1 (1)

\(n_{H_2}=\dfrac{4,48}{22,4}=0,2\left(mol\right)\)

PTHH: Fe + 2HCl --> FeCl₂ + H₂

              a-->2a-------->a---->a

            Zn + 2HCl --> ZnCl₂ + H₂

              b---->2b---->b------->b

=> a + b = 0,2 (2)

(1)(2) => a = 0,1 (mol); b = 0,1 (mol)

\(\left\{{}\begin{matrix}\%m_{Fe}=\dfrac{0,1.56}{12,1}.100\%=46,28\%\\\%m_{Zn}=\dfrac{0,1.65}{12,1}.100\%=53,72\%\end{matrix}\right.\)

b) n_HCl = 2a + 2b = 0,4 (mol)

=> \(V_{dd.HCl}=\dfrac{0,4}{1}=0,4\left(l\right)\)

c) \(\left\{{}\begin{matrix}C_{M\left(FeCl_2\right)}=\dfrac{0,1}{0,4}=0,25M\\C_{M\left(ZnCl_2\right)}=\dfrac{0,1}{0,4}=0,25M\end{matrix}\right.\)