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

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

mol     0,1         0,2         0,1

b) \(V_{HCl}=\dfrac{0,2}{2}=0,1\left(l\right)=100\left(ml\right)\)

c) \(^mZnCl_2=0,1.136=13,6\left(g\right)\)

Chúc bạn học tốt!!! 

Em cần hỗ trợ hết ngần này bài hả em?

Câu 8:

mHCl=50.7,3%=3,65(g)

=>nHCl=0,1(mol)

a) PTHH: Zn + 2 HCl -> ZnCl2 + H2

nZn=nH2=nZnCl2=nHCl/2=0,1/2=0,05(mol)

b) =>mZn=0,05.65=3,25(g)

c) V(H2,đktc)=0,05.22,4=1,12(l)

d) mZnCl2=0,05.136=6,8(g)

\(n_{Zn}=\dfrac{13}{65}=0,2mol\)

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

0,2      0,4            0,2                  ( mol )

\(m_{HCl}=0,4.36,5=14,6g\)

\(m_{ddHCl}=\dfrac{14,6\times100}{14,6}=100g\)

\(m_{ddspứ}=100+13=113g\)

\(m_{ZnCl_2}=0,2.136=27,2g\)

\(C\%_{ZnCl_2}=\dfrac{27,2}{113}.100=24,07\%\)

\(n_{Zn}=\dfrac{6,5}{65}=0,1\left(mol\right)\\ n_{HCl}=0,2.2=0,4\left(mol\right)\\ Zn+2HCl\xrightarrow[]{}ZnCl_2+H_2\\ \Rightarrow\dfrac{0,1}{1}< \dfrac{0,4}{2}\Rightarrow HCl.dư\\ n_{HCl\left(pư\right)}=0,1.2=0,2\left(mol\right)\)

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

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

             1         2              1          1

            0,1      0,2          0,1

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

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

c) \(n_{ZnCl2}=\dfrac{0,2.1}{2}=0,1\left(mol\right)\)

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

 Chúc bạn học tốt

\(a/\\ Zn+2HCl \to ZnCl_2+H_2\\ b/\\ n_{Zn}=0,1(mol)\\ n_{HCl}=0,2(mol)\\ V_{HCl}=\frac{0,2}{1}=0,2(l)\\ c/\\ n_{ZnCl_2}=0,1(mol)\\ CM_{ZnCl_2}=\frac{0,1}{0,2}=0,5M\)

\(n_{H_2}=\dfrac{0,896}{22,4}=0,04mol\\ Zn+2HCl\rightarrow ZnCl_2+H_2\uparrow\)

0,04       0,08        0,04        0,04

\(m_{Zn}=0,04.65=2,6g\\ m_{ddHCl}=\dfrac{0,04.36,5}{14,6}\cdot100=10g\)

a, \(Fe+2HCl\rightarrow FeCl_2+H_2\)

b, Có lẽ phần này đề hỏi khối lượng sắt chứ bạn nhỉ?

 \(n_{ZnCl_2}=0,4.2=0,8\left(mol\right)\)

Theo PT: \(n_{Fe}=n_{FeCl_2}=0,8\left(mol\right)\Rightarrow m_{Fe}=0,8.56=44,8\left(g\right)\)

c, \(n_{H_2}=n_{FeCl_2}=0,8\left(mol\right)\Rightarrow V_{H_2}=0,8.22,4=17,92\left(l\right)\)

d, \(n_{HCl}=2n_{FeCl_2}=1,6\left(mol\right)\Rightarrow C_{M_{HCl}}=\dfrac{1,6}{0,4}=4\left(M\right)\)

n_Zn = 0,1 mol

Zn + 2HCl \(\rightarrow\) ZnCl₂ + H₂

\(\Rightarrow\) V = \(\dfrac{0,1}{2}\) = 0,05 (l)

\(\Rightarrow\) V_H2 = 0,1.22,4 = 2,24 (l)

\(\Rightarrow\) m_ZnCl2 = 0,1.136 = 13,6 (g)

b,\(n_{HCl}=0,2.2=0,4\left(mol\right)\)

PTHH: CuO + 2HCl → CuCl₂ + H₂

Mol:     0,2         0,4  

\(\Rightarrow m_{CuO}=0,2.80=16\left(g\right)\)

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

PTHH: ZnO + H₂SO₄ → ZnSO₄ + H₂

Mol:      0,2         0,2

\(\Rightarrow V_{ddH_2SO_4}=\dfrac{0,2}{2}=0,1\left(l\right)\)

d,\(n_{H_2SO_4}=2.0,1=0,2\left(mol\right)\)

PTHH: H₂SO₄ + 2KOH → K₂SO₄ + 2H₂O

Mol:     0,2           0,4

\(\Rightarrow V_{ddKOH}=\dfrac{0,4}{1}=0,4\left(l\right)\)

Zn+2HCl->ZnCl₂+H₂

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

n Zn =0,1 mol

VHCl=\(\dfrac{0,2}{2}=0,1l=100ml\)

=>CM dd =\(\dfrac{0,1}{0,1}=1M\)