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![](https://rs.olm.vn/images/avt/0.png?1311)
a. PTHH: Zn + H2SO4 ---> ZnSO4 + H2↑
b. Ta có: \(C_{M_{H_2SO_4}}=\dfrac{n_{H_2SO_4}}{200:1000}=1,5M\)
=> \(n_{H_2SO_4}=0,3\left(mol\right)\)
Ta lại có: \(n_{Zn}=\dfrac{16,25}{65}=0,25\left(mol\right)\)
Ta thấy: \(\dfrac{0,3}{1}>\dfrac{0,25}{1}\)
Vậy H2SO4 dư.
Theo PT: \(n_{H_2}=n_{Zn}=0,25\left(mol\right)\)
=> \(V_{H_2}=0,25.22,4=5,6\left(lít\right)\)
c. Theo PT: \(n_{ZnSO_4}=n_{Zn}=0,25\left(mol\right)\)
=> \(m_{ZnSO_4}=0,25.161=40,25\left(g\right)\)
d. Ta có: \(V_{dd_{ZnSO_4}}=0,2\left(lít\right)\)
=> \(C_{M_{ZnSO_4}}=\dfrac{0,25}{0,2}=1,25M\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(a,PTHH:Fe+2HCl\rightarrow FeCl_2+H_2\\ b,n_{Fe}=\dfrac{11,2}{56}=0,2\left(mol\right)\\ \Rightarrow n_{HCl}=2n_{Fe}=0,4\left(mol\right)\\ \Rightarrow C_{M_{HCl}}=\dfrac{0,4}{0,2}=2M\\ c,PTHH:HCl+NaOH\rightarrow NaCl+H_2O\\ \Rightarrow n_{NaOH}=n_{HCl}=0,4\left(mol\right)\\ \Rightarrow m_{CT_{NaOH}}=0,4\cdot40=16\left(g\right)\\ \Rightarrow m_{dd_{NaOH}}=\dfrac{16\cdot100\%}{16\%}=100\left(g\right)\)
Tham khảo
a.Fe+2HCL--> FeCl2+H2
b.Ta có số mol của sắt: n = 11,2/56=0,2 (mol)
Theo PTHH, ta có : 1 mol Fe -->1 mol H2
0,2 mol Fe --> 0,2 mol H2
Do đó, thể tích của H2 là :
V = n . 22,4 = 0,2 . 22,4 =4,48 (lít)
c. Ta có: C% = (0,2 . 56 / (0,2 . 2). 36,5 ).100% =76,71 % (mk không chắc chắn đâu )
d.Theo PTHH, ta có : 1 mol Fe --> 1 mol FeCl2
0,2 mol Fe --> 0,2 mol FeCl2
Do đó, khối lương muối tạo thành :
m = n . M = 0,2 . 127 = 25,4 (g)
![](https://rs.olm.vn/images/avt/0.png?1311)
a)\(n_{Fe}=\dfrac{14}{56}=0,25\left(mol\right)\)
PTHH: Fe + 2HCl → FeCl2 + H2
Mol: 0,25 0,5 0,25
b) \(C_{M_{ddHCl}}=\dfrac{0,5}{0,5}=1M\)
c) \(V_{H_2}=0,25.22,4=5,6\left(l\right)\)
![](https://rs.olm.vn/images/avt/0.png?1311)
Câu 15 :
\(n_{Al}=\dfrac{10,8}{27}=0,4\left(mol\right)\)
Pt : \(2Al+6HCl\rightarrow2AlCl_3+3H_2\)
0,4----->1,2------->0,4------>0,6
\(m_{HCl}=1,2.36,5=43,8\left(g\right)\)
\(\Rightarrow m_{ddHCl}=\dfrac{43.8.100\%}{25\%}=175,2\left(g\right)\)
\(m_{ddspu}=10,8+175,2-0,6.2=184,8\left(g\right)\)
\(C\%_{AlCl3}=\dfrac{0,4.133,5}{184,8}.100\%=28,9\%\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) $CaCO_3 + 2HCl \to CaCl_2 + CO_2 + H_2O$
Theo PTHH :
$n_{CO_2} = n_{CaCO_3} = \dfrac{10}{100} = 0,1(mol)$
$V_{CO_2} = 0,1.22,4 = 2,24(lít)$
b) $n_{HCl} = 2n_{CaCO_3} = 0,2(mol)$
$C_{M_{HCl}} = \dfrac{0,2}{0,25} = 0,8M$
c) $CO_2 + Ca(OH)_2 \to CaCO_3 + H_2O$
$n_{CaCO_3} = n_{CO_2} = 0,1(mol)$
$m_{CaCO_3} = 0,1.100 = 10(gam)$
![](https://rs.olm.vn/images/avt/0.png?1311)
Ta có: \(n_{Fe}=\dfrac{14}{56}=0,25\left(mol\right)\)
a. \(PTHH:Fe+H_2SO_4--->FeSO_4+H_2\uparrow\)
b. Theo PT: \(n_{H_2}=n_{Fe}=n_{H_2SO_4}=0,25\left(mol\right)\)
\(\Rightarrow V_{H_2}=0,25.22,4=5,6\left(lít\right)\)
c. Ta có: \(m_{H_2SO_4}=0,25.98=24,5\left(g\right)\)
\(\Rightarrow C_{\%_{H_2SO_4}}=\dfrac{24,5}{486,5}.100\%=5,04\%\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a, PT: \(Fe+H_2SO_4\rightarrow FeSO_4+H_2\)
b, Ta có: \(n_{Fe}=\dfrac{19,6}{56}=0,35\left(mol\right)\)
Theo PT: \(n_{H_2}=n_{Fe}=0,35\left(mol\right)\Rightarrow V_{H_2}=0,35.22,4=7,84\left(l\right)\)
c, \(n_{H_2SO_4}=n_{Fe}=0,35\left(mol\right)\Rightarrow C_{M_{H_2SO_4}}=\dfrac{0,35}{0,2}=1,75\left(M\right)\)
d, \(n_{FeSO_4}=n_{Fe}=0,35\left(mol\right)\Rightarrow m_{FeSO_4}=0,35.152=53,2\left(g\right)\)
e, \(C_{M_{FeSO_4}}=\dfrac{0,35}{0,2}=1,75\left(M\right)\)
d, \(n_{H_2SO_4}=0,25.1,6=0,4\left(mol\right)\)
Xét tỉ lệ: \(\dfrac{n_{Fe}}{1}< \dfrac{n_{H_2SO_4}}{1}\), ta được H2SO4 dư.
Theo PT: \(n_{H_2SO_4\left(pư\right)}=n_{Fe}=0,35\left(mol\right)\)
\(\Rightarrow n_{H_2SO_4\left(dư\right)}=0,4-0,35=0,05\left(mol\right)\)
\(\Rightarrow m_{H_2SO_4\left(dư\right)}=0,05.98=4,9\left(g\right)\)
a)
\(PTHH:Fe+2HCl\rightarrow FeCl_2+H_2\)
b)
\(n_{Fe}=\dfrac{5,6}{56}=0,1mol\)
Theo PT:\(n_{HCl}=2n_{Fe}=0,2mol\)
\(\Rightarrow C_MHCl=\dfrac{0,2}{0,2}=1M\)
c)
Theo PT:\(n_{H_2}=n_{Fe}=0,1mol\)
\(\Rightarrow V_{H_2}=0,1.22,4=2,24l\)