a, \(Zn+2HCl\rightarrow ZnCl_2+H_2\)

b, Ta có: \(n_{H_2}=\dfrac{22,4}{22,4}=1\left(mol\right)\)

Theo PT: \(n_{Zn}=n_{H_2}=1\left(mol\right)\Rightarrow m_{Zn}=1.65=65\left(g\right)\)

\(\Rightarrow m_{Cu}=80,5-65=15,5\left(g\right)\)

giúp minh với các bạn 

a, Cu không tác dụng với dd HCl.

PT: \(Zn+2HCl\rightarrow ZnCl_2+H_2\)

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

Theo PT: \(n_{Zn}=n_{H_2}=0,2\left(mol\right)\)

\(\Rightarrow m_{Zn}=0,2.65=13\left(g\right)\)

\(\Rightarrow m_{Cu}=19,4-13=6,4\left(g\right)\)

c, Ta có: \(\left\{{}\begin{matrix}\%m_{Zn}=\dfrac{13}{19,4}.100\%\approx67,01\%\\\%m_{Cu}\approx32,99\%\end{matrix}\right.\)

Bạn tham khảo nhé!

a) \(Zn+2HCl\rightarrow ZnCl_2+H_2\)

\(Fe+2HCl\rightarrow FeCl_2+H_2\)

\(Đặt:n_{Zn}=x\left(mol\right);n_{Fe}=y\left(mol\right)\)

\(n_{H_2}=0,4\left(mol\right)\)

Theo đề ta có hệ \(\left\{{}\begin{matrix}65x+56y=24,2\\x+y=0,4\end{matrix}\right.\)

=> x=0,2 ; y=0,2

\(\%m_{Zn}=\dfrac{0,2.65}{24,2}.100=53,72\%;\%m_{Fe}=46,28\%\)

b)Bảo toàn nguyên tố H: \(n_{HCl}=2n_{H_2}=0,8\left(mol\right)\)

=> \(V_{HCl}=\dfrac{0,8}{2,5}=0,32\left(l\right)\)

c) \(n_{FeCl_2}=0,2\left(mol\right);n_{ZnCl_2}=0,2\left(mol\right)\)

=> \(CM_{FeCl_2}=\dfrac{0,2}{0,32}=0,625\left(mol\right)\)

\(CM_{ZnCl_2}=\dfrac{0,2}{0,32}=0,625\left(mol\right)\)

tham khảo ở đây nha:

https://hoidap247.com/cau-hoi/2130844

PTHH: \(Mg+2HCl\rightarrow MgCl_2+H_2\)

\(n_{H_2}=\dfrac{13,44}{22,4}=0,6\left(mol\right)\)

Theo PTHH: \(n_{Mg}=n_{H_2}=0,6\left(mol\right)\)

=> \(m_{Mg}=0,6.24=14,4\left(g\right)\)

=> \(m_{Cu}=50-14,4=35,6\left(g\right)\)

\(\Rightarrow\left\{{}\begin{matrix}\%Mg=\dfrac{14,4}{50}.100=28,8\%\\\%Cu=\dfrac{35,6}{50}.100=71,2\%\end{matrix}\right.\)

\(n\)_H2 =\(\dfrac{13,44}{22,4}\) =0,6(mol)
PTHH:
Mg +HCl →MgCl₂ + H₂
0,6 mol                 ←0,6 mol
a) \(m\)_Mg =0,6. 24 =14,4(g)
    \(m\)_Cu= 50- 14,4= 35,6(g)
b)\(m\)%_Mg= \(\dfrac{14,4}{50}\).100%= 28,8%
   \(m\)%_Cu=100%- 28,8%= 71,2%
 

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

PTHH: Zn + 2HCl → ZnCl₂ + H₂

Mol:     0,2                              0,2

(do Cu ko tác dụng với HCl loãng)

b, \(m_{Zn}=0,2.65=13\left(g\right)\)

  \(m_{Cu}=19,4-13=6,4\left(g\right)\)

\(n_{H_2}=\dfrac{1.12}{22.4}=0.05\left(mol\right)\)

\(Zn+2HCl\rightarrow ZnCl_2+H_2\)

\(0.05..............................0.05\)

\(m_{Cu}=9.65-0.05\cdot65=6.4\left(g\right)\)

\(\%Cu=\dfrac{6.4}{9.65}\cdot100\%=66.32\%\)

\(\%Zn=100-66.32=33.68\%\)