\(a.CuO+2HCl\rightarrow CuCl_2+H_2O\\ ZnO+2HCl\rightarrow ZnCl_2+H_2\\ n_{HCl}=0,4.3=1,2mol\\ n_{CuCl_2}=a;n_{ZnCl_2}=b\\ \Rightarrow\left\{{}\begin{matrix}80a+81b=48,5\\2a+2b=1,2\end{matrix}\right.\\ \Rightarrow a=0,1,b=0,5\\ m_O=16\left(0,1+0,5\right)=9,6g\\ c.m_{CuCl_2}=0,1.135=13,5g\\ m_{ZnCl_2}=0,5.136=68g\\ d.C_{M_{CuCl_2}}=\dfrac{0,1}{0,4}=0,25M\\ C_{M_{ZnCl_2}}=\dfrac{0,5}{0,4}=1,25M\)

a, \(CuO+2HCl\rightarrow CuCl_2+H_2O\)

\(ZnO+2HCl\rightarrow ZnCl_2+H_2O\)

b, \(n_{HCl}=0,4.3=1,2\left(mol\right)\)

→ \(O+2H\rightarrow H_2O\)

⇒ n_O = 0,6 (mol)

⇒ m_O = 0,6.16 = 9,6 (g)

c, Theo PT: \(n_{H_2O}=\dfrac{1}{2}n_{HCl}=0,6\left(mol\right)\)

Theo ĐLBT KL, có: m _oxit + m_HCl = m _muối + m_H2O

⇒ 48,5 + 1,2.36,5 = m _muối + 0,6.18

⇒ m _muối = 81,5 (g)

d, Ta có: 135n_CuCl2 + 136n_ZnCl2 = 81,5 (1)

Theo PT: \(\left\{{}\begin{matrix}n_{CuO}=n_{CuCl_2}\\n_{ZnO}=n_{ZnCl_2}\end{matrix}\right.\) ⇒ 80n_CuCl2 + 81n_ZnCl2 = 48,5 (2)

Từ (1) và (2) \(\Rightarrow\left\{{}\begin{matrix}n_{CuCl_2}=0,1\left(mol\right)\\n_{ZnCl_2}=0,5\left(mol\right)\end{matrix}\right.\)

\(\Rightarrow\left\{{}\begin{matrix}C_{M_{CuCl_2}}=\dfrac{0,1}{0,4}=0,25\left(M\right)\\C_{M_{ZnCl_2}}=\dfrac{0,5}{0,4}=1,25\left(M\right)\end{matrix}\right.\)

CuO +2HCl= CuCl2 +H2O
ZnO+2HCl= ZnCl2 +H2O
gọi x,y là mol của CuO, ZnO
80x + 81y = 12.1
2x+2y = 0.3
=> x=0.05 , y=0.1 => mCuO= 4 %CuO=4/12.1 m ZnO=8.1 =>%ZnO=8.1/12.1
nH2SO4=1/2nHCl=0.3/2 =0.15
mH2SO4=0.15x98=14.7g => mddH2SO4=14.7/20%=73.5g

Đặt : \(n_{CuO}=a\left(mol\right),n_{ZnO}=b\left(mol\right)\)

\(\Rightarrow80a+81b=28,25g\left(1\right)\)

a) Pt : \(CuO+2HCl\rightarrow CuCl_2+H_2O\)

\(ZnO+2HCl\rightarrow ZnCl_2+H_2O\)

b) Ta có : \(n_{HCl}=\dfrac{20\%.127,75}{100\%.36,5}=0,7\left(mol\right)\Rightarrow2a+2b=0.7\left(2\right)\)

Từ (1),(2) \(\Rightarrow\left\{{}\begin{matrix}a=0,1=n_{CuCl2}\\b=0,25=n_{ZnCl2}\end{matrix}\right.\)

c) \(m_{muối}=m_{CuCl2}+m_{ZnCl2}=0,1.135+0,25.136=47,5\left(g\right)\)

d) \(\left\{{}\begin{matrix}C\%_{CuCl2}=\dfrac{0,1.135}{28,25+127,75}.100\%=8,65\%\\C\%_{ZnCl2}=\dfrac{0,25.136}{28,25+127,75}.100\%=21,79\%\end{matrix}\right.\)

CuO +2HCl= CuCl2 +H2O 
ZnO+2HCl= ZnCl2 +H2O 
gọi x,y là mol của CuO, ZnO 
80x + 81y = 12.1 
2x+2y = 0.3 
=> x=0.05 , y=0.1 => mCuO= 4 %CuO=4/12.1 m ZnO=8.1 =>%ZnO=8.1/12.1 
nH2SO4=1/2nHCl=0.3/2 =0.15 
mH2SO4=0.15x98=14.7g => mddH2SO4=14.7/20%=73.5g

a, \(CuO+2HCl\rightarrow CuCl_2+H_2O\)

\(ZnO+2HCl\rightarrow ZnCl_2+H_2O\)

b, Ta có: 80n_CuO + 81n_ZnO = 12,1 (1)

Theo PT: \(n_{HCl}=2n_{CuO}+2n_{ZnO}=0,2.1,5=0,3\left(mol\right)\left(2\right)\)

\(\Rightarrow\left\{{}\begin{matrix}n_{CuO}=0,05\left(mol\right)\\n_{ZnO}=0,1\left(mol\right)\end{matrix}\right.\)

\(\Rightarrow\left\{{}\begin{matrix}\%m_{CuO}=\dfrac{0,05.80}{12,1}.100\%\approx33,06\%\\\%m_{ZnO}\approx66,94\%\end{matrix}\right.\)

Đổi 300ml = 0,3 lít

Ta có: \(n_{HCl}=2.0,3=0,6\left(mol\right)\)

a. PTHH: 

CuO + 2HCl ---> CuCl₂ + H₂O (1)

ZnO + 2HCl ---> ZnCl₂ + H₂O (2)

b. Gọi x, y lần lượt là số mol của CuO và ZnO

Theo PT₍₁₎: \(n_{HCl}=2.n_{CuO}=2x\left(mol\right)\)

Theo PT₍₂₎: \(n_{HCl}=2.n_{ZnO}=2y\left(mol\right)\)

=> 2x + 2y = 0,6 (*)

Theo đề, ta có: 80x + 81y = 24,2 (**)

Từ (*) và (**), ta có HPT:

\(\left\{{}\begin{matrix}2x+2y=0,6\\80x+81y=24,2\end{matrix}\right.\)

=> \(\left\{{}\begin{matrix}x=0,1\\y=0,2\end{matrix}\right.\)

=> \(m_{CuO}=0,1.80=8\left(g\right)\)

=> \(\%_{m_{CuO}}=\dfrac{8}{24,2}.100\%=33,06\%\)

\(\%_{m_{Zn}}=100\%-33,06\%=66,94\%\)

c. PTHH:

CuO + H₂SO₄ ---> CuSO₄ + H₂O (3)

ZnO + H₂SO₄ ---> ZnSO₄ + H₂O (4)

Theo PT₍₃₎: \(n_{H_2SO_4}=n_{CuO}=0,1\left(mol\right)\)

Theo PT₍₄₎: \(n_{H_2SO_4}=n_{ZnO}=0,2\left(mol\right)\)

=> \(n_{H_2SO_4}=0,1+0,2=0,3\left(mol\right)\)

=> \(m_{H_2SO_4}=0,3.98=29,4\left(g\right)\)

Ta có: \(C_{\%_{H_2SO_4}}=\dfrac{29,4}{m_{dd_{H_2SO_4}}}.100\%=20\%\)

=> \(m_{dd_{H_2SO_4}}=147\left(g\right)\)

a, \(CuO+2HCl\rightarrow CuCl_2+H_2O\)

\(Fe_2O_3+6HCl\rightarrow2FeCl_3+3H_2O\)

b, Gọi: \(\left\{{}\begin{matrix}n_{CuO}=x\left(mol\right)\\n_{Fe_2O_3}=y\left(mol\right)\end{matrix}\right.\) ⇒ 80x + 160y = 32 (1)

Theo PT: \(\left\{{}\begin{matrix}n_{CuCl_2}=n_{Cu}=x\left(mol\right)\\n_{FeCl_3}=2n_{Fe_2O_3}=2y\left(mol\right)\end{matrix}\right.\) ⇒ 135x + 325y = 59,5 (2)

Từ (1) và (2) \(\Rightarrow\left\{{}\begin{matrix}x=0,2\left(mol\right)\\y=0,1\left(mol\right)\end{matrix}\right.\)

\(\Rightarrow\left\{{}\begin{matrix}m_{CuO}=0,2.80=16\left(g\right)\\m_{Fe_2O_3}=0,1.160=16\left(g\right)\end{matrix}\right.\)

c, Theo PT: \(n_{HCl}=2n_{CuO}+6n_{Fe_2O_3}=1\left(mol\right)\)

\(\Rightarrow V_{ddHCl}=\dfrac{1}{0,5}=2\left(l\right)\)