cho 19,5g Zn tác dụng hết với dung dịch HCl
a, viết ptpư
b, tính thể tích H2 thu được (đktc)
c, tính khối lượng Hcl cần dùng
MN GIÚP MÌNH VỚI MÌNH CẢM ƠN Ạ
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![](https://rs.olm.vn/images/avt/0.png?1311)
a, \(n_{Zn}=\dfrac{19,5}{65}=0,3\left(mol\right)\)
PT: \(Zn+2HCl\rightarrow ZnCl_2+H_2\)
Theo PT: \(n_{ZnCl_2}=n_{Zn}=0,3\left(mol\right)\Rightarrow m_{ZnCl_2}=0,3.136=40,8\left(g\right)\)
b, \(n_{H_2}=n_{Zn}=0,3\left(mol\right)\Rightarrow V_{H_2}=0,3.22,4=6,72\left(l\right)\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) \(Fe+2HCl\text{→}FeCl_2+H_2\)
n Fe = 2,8:56=0,05 mol = n H2
V H2 = 0,05.22,4=1,12 lít
n HCl = n Fe .2 =0,1 mol
m HCl = 0,1.(1+35,5)=3,65 g
a) PTHH: \(Fe+2HCl\rightarrow FeCl_2+H_2\uparrow\)
b) \(n_{H_2}=n_{Fe}=\dfrac{2,8}{56}=0,05\left(mol\right)\)
\(\Rightarrow V_{H_2}=n.22,4=0,05.22,4=1,12\left(l\right)\)
c) \(n_{HCl}=2n_{Fe}=0,1\left(mol\right)\)
\(m_{HCl}=n.M=0,1.36,5=3,65\left(g\right)\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) $Zn + 2HCl \to ZnCl_2 + H_2$
b) Theo PTHH :
$n_{ZnCl_2} = n_{Zn} = \dfrac{6,5}{65} = 0,1(mol)$
$m_{ZnCl_2} = 0,1.136 = 13,6(gam)$
c)
$n_{H_2} = n_{Zn} = 0,1(mol) \Rightarrow V_{H_2} = 0,1.22,4 = 2,24(lít)$
d)
$n_{HCl} = 2n_{Zn} = 0,2(mol) \Rightarrow C_{M_{HCl}} = \dfrac{0,2}{0,5} = 0,4M$
![](https://rs.olm.vn/images/avt/0.png?1311)
\(n_{Zn}=\dfrac{26}{65}=0,4\left(mol\right)\)
a) Pt : \(Zn+2HCl\rightarrow ZnCl_2+H_2|\)
1 2 1 1
0,4 0,8 0,4
b) \(n_{H2}=\dfrac{0,4.1}{1}=0,4\left(mol\right)\)
\(V_{H2\left(dtkc\right)}=0,4.22,4=8,96\left(l\right)\)
c) \(NaOH+HCl\rightarrow NaCl+H_2O|\)
1 1 1 1
0,8 0,8
\(n_{NaOH}=\dfrac{0,8.1}{1}=0,8\left(mol\right)\)
\(V_{ddNaOH}=\dfrac{0,8}{2}=0,4\left(l\right)\)
Chúc bạn học tốt
![](https://rs.olm.vn/images/avt/0.png?1311)
PTHH: \(Zn+2HCl\rightarrow ZnCl_2+H_2\uparrow\)
Ta có: \(n_{Zn}=\dfrac{32,5}{65}=0,5\left(mol\right)\)
\(\Rightarrow\left\{{}\begin{matrix}n_{HCl}=1\left(mol\right)\\n_{H_2}=0,5\left(mol\right)\end{matrix}\right.\) \(\Rightarrow\left\{{}\begin{matrix}m_{ddHCl}=\dfrac{1\cdot36,5}{20\%}=182,5\left(g\right)\\V_{H_2}=0,5\cdot22,4=11,2\left(l\right)\end{matrix}\right.\)
![](https://rs.olm.vn/images/avt/0.png?1311)
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, \(n_{HCl}=2n_{Zn}=0,2\left(mol\right)\Rightarrow m_{HCl}=0,2.36,5=7,3\left(g\right)\)
\(Zn+2HCl\rightarrow ZnCl_2+H_2\)
\(1mol\) \(2mol\) \(1mol\)
\(0,1mol\) \(0,2mol\) \(0,1mol\)
\(n_{Zn}=\dfrac{m}{M}=\dfrac{6,5}{65}=0,1\left(mol\right)\)
\(m_{HCl}=n.M=0,2.36,5=7,3\left(g\right)\)
\(V_{H_2}=n.22,4=0,1.22,4=2,24\left(l\right)\)
![](https://rs.olm.vn/images/avt/0.png?1311)
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
Zn+2HCl->ZnCl2+H2
0,3--0,6------0,3-----0,3
n Zn=\(\dfrac{19,5}{65}=0,3mol\)
=>VH2=0,3.22,4=6,72l
=>m HCl=0,6.36,5=21,9g
mình cảm ơn bạn