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Zn+2HCl->Zncl2+H2
0,4----0,8----0,4----0,4
n Zn=0,4 mol
VH2=0,4.22,4=8,96l
m ZnCl2=0,4.136=54,4g
2H2+O2-to>2H2O
0,4------0,2----0,4
n O2=0,2 mol
=>pứ hết
=>m H2O=0,4.18=7,2g
a.b.\(n_{Zn}=\dfrac{26}{65}=0,4mol\)
\(Zn+2HCl\rightarrow ZnCl_2+H_2\)
0,4 0,4 0,4 ( mol )
\(m_{ZnCl_2}=0,4.136=54,4g\)
\(V_{H_2}=0,4.22,4=8,96l\)
c.\(n_{O_2}=\dfrac{4,48}{22,4}=0,2mol\)
\(2H_2+O_2\rightarrow\left(t^o\right)2H_2O\)
0,4 = 0,2 ( mol )
0,4 0,2 0,4 ( mol )
\(m_{H_2O}=0,4.18=7,2g\)
PTHH: \(Zn+2HCl\rightarrow ZnCl_2+H_2\uparrow\)
Ta có: \(n_{Zn}=\dfrac{32,5}{65}=0,5\left(mol\right)\)
\(\Rightarrow\left\{{}\begin{matrix}n_{HCl}=1\left(mol\right)\\n_{H_2}=0,5\left(mol\right)\end{matrix}\right.\) \(\Rightarrow\left\{{}\begin{matrix}m_{ddHCl}=\dfrac{1\cdot36,5}{20\%}=182,5\left(g\right)\\V_{H_2}=0,5\cdot22,4=11,2\left(l\right)\end{matrix}\right.\)
\(n_{Zn}=\dfrac{6,5}{65}=0,1\left(mol\right)\\
pthh:Zn+2HCl\rightarrow ZnCl_2+H_2\uparrow\)
0,1 0,1 0,1
\(V_{H_2}=0,1.22,4=2,24\left(l\right)\\
m_{ZnCl_2}=136.0,1=13,6\left(g\right)\)
\(m_{\text{dd}}=6,5+150-\left(0,1.2\right)=156,3\left(g\right)\\
C\%=\dfrac{13,6}{156,3}.100\%=8,7\%\)
a, \(Zn+2HCl\rightarrow ZnCl_2+H_2\)
b, \(n_{Zn}=\dfrac{6,5}{65}=0,1\left(mol\right)\)
Theo PT: \(n_{H_2}=n_{Zn}=0,1\left(mol\right)\Rightarrow V_{H_2}=0,1.22,4=2,24\left(l\right)\)
c, \(n_{HCl}=2n_{Zn}=0,2\left(mol\right)\Rightarrow m_{HCl}=0,2.36,5=7,3\left(g\right)\)
\(Zn+2HCl\rightarrow ZnCl_2+H_2\)
\(1mol\) \(2mol\) \(1mol\)
\(0,1mol\) \(0,2mol\) \(0,1mol\)
\(n_{Zn}=\dfrac{m}{M}=\dfrac{6,5}{65}=0,1\left(mol\right)\)
\(m_{HCl}=n.M=0,2.36,5=7,3\left(g\right)\)
\(V_{H_2}=n.22,4=0,1.22,4=2,24\left(l\right)\)
* Tóm tắt:
Biết: mZn = 6,5 (g)
CM(dd.HCl) = 0,5M
Hỏi: a) VH2 = ?
b) Vdd HCl = ?
a) \(n_{Zn}=\dfrac{6,5}{65}=0,1\left(mol\right)\)
PTHH: Zn + 2HCl --> ZnCl2 + H2
0,1-->0,2------------->0,1
VH2 = 0,1.22,4 = 2,24 (l)
b) \(V_{\left(dd.HCl\right)}=\dfrac{0,2}{0,5}=0,4\left(l\right)\)
nZn = 6.5/65 = 0.1 (mol)
Zn + 2HCl => ZnCl2 + H2
0.1.......0.2...................0.1
VddHCl = 0.2/2 = 0.1 (l)
nFe = 3/56 (mol)
Fe2O3 + 3H2 -to-> 2Fe + 3H2O
.................9/112........3/56
H% = 9/112 / 0.1 * 100% = 80.35%
a) Zn + 2HCl $\to$ ZnCl2 + H2
b) n Zn = 6,5/65 = 0,1(mol)
Theo PTHH : n HCl = 2n Zn = 0,2(mol)
=> V dd HCl = 0,2/2 = 0,1(lít)
c) n Fe = 3/56 (mol)
Fe2O3 + 3H2 $\xrightarrow{t^o}$ 2Fe + 3H2O
Theo PTHH :
n H2 = 3/2 n Fe = 9/112(mol)
Vậy :
H = $\dfrac{ \dfrac{9}{112} }{0,1}$ .100% = 80,36%
a, \(n_{Zn}=\dfrac{6,5}{65}=0,1\left(mol\right)\)
PTHH: Zn + 2HCl ---> ZnCl2 + H2
0,1--->0,2------->0,1----->0,1
VH2 = 0,1.22,4 = 2,24 (l)
b, \(C_{M\left(HCl\right)}=\dfrac{0,2}{0,2}=1M\)
c, \(C_{M\left(ZnCl_2\right)}=\dfrac{0,1}{0,2}=0,5M\)
Zn+2Hcl->ZnCl2+H2
0,1------------------0,1
n Zn=0,1 mol
=>VH2=0,1.22,4=2,24l