a, \(n_{Zn}=\dfrac{6,5}{65}=0,1\left(mol\right)\)

PT: \(Zn+2HCl\rightarrow ZnCl_2+H_2\)

____0,1_____0,2______0,1_____0,1 (mol)

\(V_{H_2}=0,1.24,79=2,479\left(l\right)\)

\(m_{ZnCl_2}=0,1.136=13,6\left(g\right)\)

b, \(C_{M_{HCl}}=\dfrac{0,2}{0,1}=1\left(M\right)\)

c, \(n_{CuO}=\dfrac{12}{80}=0,15\left(mol\right)\)

PT: \(CuO+H_2\underrightarrow{t^o}Cu+H_2O\)

Xét tỉ lệ: \(\dfrac{0,15}{1}>\dfrac{0,1}{1}\), ta được CuO dư.

Theo PT: \(n_{CuO\left(pư\right)}=n_{Cu}=n_{H_2}=0,1\left(mol\right)\Rightarrow n_{CuO\left(dư\right)}=0,05\left(mol\right)\)

⇒ m _{chất rắn} = m_{CuO (dư)} + m_Cu = 0,05.80 + 0,1.64 = 10,4 (g)

a,\(n_{Zn}=\dfrac{6,5}{65}=0,1\left(mol\right)\)

PTHH: Zn + 2HCl → ZnCl₂ + H₂

Mol:    0,1      0,2        0,1          0,1

b,\(V_{H_2}=0,1.24,79=2,479\left(l\right)\)

c,\(m_{ddHCl}=\dfrac{0,2.36,5.100}{3,65}=200\left(g\right)\)

d,\(m_{ZnCl_2}=0,1.136=13,6\left(g\right)\)

e,m_{dd sau pứ} = 6,5+200-0,1.2 = 206,3 (g)

\(C\%_{ddZnCl_2}=\dfrac{13,6.100\%}{206,3}=6,59\%\)

giúp

Bài 3 : 

\(n_{Zn}=\dfrac{6,5}{65}=0,1\left(mol\right)\)

a) Pt : \(Zn+2HCl\rightarrow ZnCl_2+H_2|\)

            1          2             1           1

           0,1      0,2           0,1        0,1

b) \(n_{H2}=\dfrac{0,1.1}{1}=0,1\left(mol\right)\)

\(V_{H2\left(dktc\right)}=0,1.22,4=2,24\left(l\right)\)

c) \(n_{HCl}=\dfrac{0,1.2}{1}=0,2\left(mol\right)\)

\(m_{HCl}=0,2.36,5=7,3\left(g\right)\)

\(m_{ddHCl}=\dfrac{7,3.100}{3,65}=200\left(g\right)\)

d) \(n_{ZnCl2}=\dfrac{0,1.1}{1}=0,1\left(mol\right)\)

⇒ \(m_{ZnCl2}=0,1.136=13,6\left(g\right)\)

e) \(m_{ddspu}=6,5+200-\left(0,1.2\right)=206,3\left(g\right)\)

\(C_{ZnCl2}=\dfrac{13,6.100}{206,3}=6,6\)⁰/₀

 Chúc bạn học tốt

Bài 9 : 

\(n_{CuO}=\dfrac{4}{80}=0,05\left(mol\right)\)

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

0,05--->0,1-------->0,05 

a) \(C_{MddHCl}=\dfrac{0,1}{0,1}=1\left(M\right)\)

b) \(m_{CuCl2}=0,05.135=6,75\left(g\right)\)

c) \(C_{MCuCl2}=\dfrac{0,05}{0,1}0,5\left(M\right)\)

Câu 10 : 

\(n_{FeO}=\dfrac{3,6}{72}=0,05\left(mol\right)\)

\(FeO+2HCl\rightarrow FeCl_2+H_2O\)

0,05-->0,1------->0,05

\(m_{ddHCl}=\dfrac{0,1.36,5}{10\%}100\%=36,5\left(g\right)\)

\(m_{ddspu}=3,6+36,5=40,1\left(g\right)\)

\(C\%_{FeCl2}=\dfrac{0,05.127}{40,1}.100\%=15,84\%\)

Câu 10 :

\(n_{FeO}=\dfrac{3,6}{72}=0,05\left(mol\right)\)

PTHH :

\(FeO+2HCl\rightarrow FeCl_2+H_2O\)

0,05      0,1           0,05       0,05

\(m_{ddHCl}=\dfrac{0,1.36,5.100}{10}=36,5\left(g\right)\)

\(C\%_{FeCl_2}=\dfrac{0,05.127}{\left(3,6+36,5\right)}.100\%=15,84\%\)

Gọi x, y lần lượt là số mol của Zn và Fe

Ta có: \(n_{H_2}=\dfrac{6,72}{22,4}=0,3\left(mol\right)\)

a. PTHH:

Zn + 2HCl ---> ZnCl₂ + H₂ (1)

Fe + 2HCl ---> FeCl₂ + H₂ (2)

Theo PT₍₁₎: \(n_{H_2}=n_{Zn}=x\left(mol\right)\)

Theo PT₍₂₎: \(n_{H_2}=n_{Fe}=y\left(mol\right)\)

=> x + y = 0,3 (*)

Theo đề, ta có: 65x + 56y = 17,7 (**)

Từ (*) và (**), ta có HPT:

\(\left\{{}\begin{matrix}x+y=0,3\\65x+56y=17,7\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}x=0,1\\y=0,2\end{matrix}\right.\)

=> \(m_{Zn}=0,1.65=6,5\left(g\right)\)

=> \(\%_{m_{Zn}}=\dfrac{6,5}{17,7}.100\%=36,72\%\)

\(\%_{m_{Fe}}=100\%-36,72\%=63,28\%\)

b. Ta có: \(n_{hh_{Zn,Fe}}=0,1+0,2=0,3\left(mol\right)\)

Theo PT_{(1, 2)}: \(n_{HCl}=2.n_{hh}=2.0,3=0,6\left(mol\right)\)

=> \(m_{HCl}=0,6.36,5=21,9\left(g\right)\)

=> \(C_{\%_{HCl}}=\dfrac{21,9}{200}.100\%=10,95\%\)

a)

$Zn + CuSO_4 \to ZnSO_4 + Cu$

b)

Theo PTHH : $n_{Zn} = n_{CuSO_4} = \dfrac{3,2.10\%}{160} = 0,002(mol)$

$m_{Zn} = 0,002.65 = 0,13(gam)$

c)

$n_{Cu} = 0,002(mol)$
$\Rightarrow m_{dd\ sau\ pư} = 0,13 + 3,2 - 0,002.64 = 3,202(gam)$
$C\%_{ZnSO_4} = \dfrac{0,002.161}{3,202}.100\% = 10,06\%$

Ta có: \(n_{ZnO}=\dfrac{16,2}{81}=0,2\left(mol\right)\)

a, PT: \(ZnO+2HCl\rightarrow ZnCl_2+H_2O\)

______0,2_____0,4____0,2 (mol)

b, \(m_{HCl}=0,4.36,5=14,6\left(g\right)\Rightarrow m_{ddHCl}=\dfrac{14,6}{10\%}=146\left(g\right)\)

c, \(C\%_{ZnCl_2}=\dfrac{0,2.136}{16,2+146}.100\%\approx16,77\%\)

Bạn tham khảo nhé!

\(n_{Zn}=\dfrac{13}{65}=0.2\left(mol\right)\)

\(n_{HCl}=\dfrac{182.5\cdot10}{100\cdot36.5}=0.5\left(mol\right)\)

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

\(0.2......0.4..........0.2........0.2\)

\(n_{HCl\left(dư\right)}=0.5-0.4=0.1\left(mol\right)\)

\(m_{HCl\left(dư\right)}=0.1\cdot36.5=3.65\left(g\right)\)

\(V_{H_2}=0.2\cdot22.4=4.48\left(l\right)\)

\(m_{\text{dung dịch sau phản ứng}}=13+182.5-0.2\cdot2=195.1\left(g\right)\)

\(C\%_{HCl\left(dư\right)}=\dfrac{3.65}{195.1}\cdot100\%=1.87\%\)

\(C\%_{ZnCl_2}=\dfrac{0.2\cdot136}{195.1}\cdot100\%=13.94\%\)

200ml = 0,2l

\(n_{Zn}=\dfrac{19,5}{65}=0,3\left(mol\right)\)

Pt : \(Zn+2HCl\rightarrow ZnCl_2+H_2|\)

        1         2              1           1

     0,3      0,6             0,3        0,3

a) \(n_{ZnCl2}=\dfrac{0,3.1}{1}=0,3\left(mol\right)\)

\(C_{M_{ZnCl2}}=\dfrac{0,3}{0,2}=1,5\left(M\right)\)

b) \(n_{H2}=\dfrac{0,3.1}{1}=0,3\left(mol\right)\)

\(V_{H2\left(dktc\right)}=0,3.22,4=6,72\left(l\right)\)

c) Pt : \(NaOH+HCl\rightarrow NaCl+H_2O|\)

              1            1              1            1

            0,6          0,6

\(n_{NaOH}=\dfrac{0,6.1}{1}=0,6\left(mol\right)\)

\(m_{NaOH}=0,6.40=24\left(g\right)\)
\(m_{ddNaOH}=\dfrac{24.100}{20}=120\left(g\right)\)

 Chúc bạn học tốt

\(n_{H_2}=\dfrac{6,72}{22,4}=0,3mol\)

\(\left\{{}\begin{matrix}n_{Mg}=x\left(mol\right)\\n_{Zn}=y\left(mol\right)\end{matrix}\right.\Rightarrow24x+65y=11,3\left(1\right)\)

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

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

\(\Rightarrow x+y=0,3\left(2\right)\)

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

a)\(\%m_{Mg}=\dfrac{0,2\cdot24}{11,3}\cdot100\%=42,48\%\)

\(\%m_{Zn}=100\%-42,48\%=57,52\%\)

b)\(n_{HCl}=2\left(n_{Mg}+n_{Zn}\right)=2\cdot\left(0,2+0,1\right)=0,6mol\)

\(C_{M_{HCl}}=\dfrac{0,6}{0,2}=3M\)