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Fe+H2SO4->feSO4+H2
0,2--0,2---------0,2------0,2
n H2SO2=0,2 mol
=>m Fe=0,2.56=11,2g
=>Cm FeSO4=0,2\0,2=1M
\(n_{H_2SO_4}=0,2.1=0,2\left(mol\right)\\ a.Fe+H_2SO_4\rightarrow FeSO_4+H_2\\ 0,2........0,2.........0,2...........0,2\left(mol\right)\\ b.V_{dd.muối}=V_{ddH_2SO_4}=200\left(ml\right)=0,2\left(l\right)\\ C_{MddFeSO_4}=\dfrac{0,2}{0,2}=1\left(M\right)\)
Ta có: \(n_{Fe}=\dfrac{5,6}{56}=0,1\left(mol\right)\)
PT: \(Fe+2HCl\rightarrow FeCl_2+H_2\)
____0,1______0,2_____0,1____0,1 (mol)
a, \(C_{M_{HCl}}=\dfrac{0,2}{0,15}=\dfrac{4}{3}\left(M\right)\)
\(V_{H_2}=0,1.22,4=2,24\left(l\right)\)
b, \(FeCl_2+2NaOH\rightarrow2NaCl+Fe\left(OH\right)_2\)
Theo PT: \(n_{NaOH}=2n_{FeCl_2}=0,2\left(mol\right)\)
\(\Rightarrow V_{NaOH}=\dfrac{0,2}{2}=0,1\left(l\right)\)
\(a,PTHH:Zn+2HCl\rightarrow ZnCl_2+H_2\\ b,n_{Zn}=\dfrac{13}{65}=0,2\left(mol\right)\\ n_{HCl}=2\cdot0,15=0,3\left(mol\right)\)
Vì \(\dfrac{n_{Zn}}{1}>\dfrac{n_{HCl}}{2}\) nên sau p/ứ Zn dư
\(\Rightarrow n_{Zn}=\dfrac{1}{2}n_{HCl}=0,15\left(mol\right)\\ \Rightarrow m_{Zn}=0,15\cdot65=9,75\\ \Rightarrow m_{Zn\left(dư\right)}=13-9,75=3,25\left(g\right)\\ c,n_{H_2}=n_{Zn}=0,15\left(mol\right)\\ \Rightarrow V_{H_2}=0,15\cdot22,4=3,36\left(l\right)\)
Pt: \(2CH_3COOH+Zn\rightarrow\left(CH_3COO\right)_2Zn+H_2\)
\(n_{\left(CH_3COO\right)_2Zn}=\dfrac{14,2}{183}\approx0.077mol\)
Theo pt: nH2 = n(CH3COO)2Zn = 0,077mol
=> VH2 = 1,7248l
b) Theo pt: nCH3COOH = 2n(CH3COO)2Zn = 0,154 mol
=> CMCH3COOH = 0,154 : 0,25 = 0,616M
\(a.Fe+2HCl\rightarrow FeCl_2+H_2\\b.n_{Fe}=\dfrac{5,6}{56}=0,1\left(mol\right)\\ n_{H_2}=n_{Fe}=0,1\left(mol\right)\\ \Rightarrow V_{H_2}=0,1.22,4=2,24\left(l\right)\\ c.n_{FeCl_2}=n_{Fe}=0,1\left(mol\right)\\ m_{FeCl_2}=0,1.127=12,7\left(g\right) \)
\(n_{H_2SO_4}=0,2.1=0,2\left(mol\right)\\ Fe+H_2SO_4\rightarrow FeSO_4+H_2\\ 0,2.......0,2.........0,2.......0,2\left(mol\right)\\ m=m_{Fe}=0,2.56=11,2\left(g\right)\\ b.V_{ddFeSO_4}=V_{ddH_2SO_4}=200\left(ml\right)=0,2\left(l\right)\\ C_{MddFeSO_4}=\dfrac{0,2}{0,2}=1\left(M\right)\)
a,\(n_{HCl}=0,2.1=0,2\left(mol\right)\)
PTHH: Fe + 2HCl → FeCl2 + H2
Mol: 0,1 0,2 0,1
\(\Rightarrow m_{Fe}=0,1.56=5,6\left(g\right)\)
b,\(C_{M_{ddFeCl_2}}=\dfrac{0,1}{0,2}=0,5M\)
a)
$2Al + 6HCl \to 2AlCl_3 + 3H_2$
$n_{Al} = \dfrac{10,8}{27} = 0,4(mol)$
Theo PTHH : $n_{H_2} = \dfrac{3}{2}n_{Al} = 0,6(mol)$
$V_{H_2} = 0,6.22,4 = 13,44(lít)$
b)
$Fe_2O_3 + 3H_2 \xrightarrow{t^o} 2Fe + 3H_2O$
Theo PTHH : $n_{Fe} = \dfrac{2}{3}n_{H_2} = 0,4(mol)$
$m_{Fe} = 0,4.56 = 22,4(gam)$
Fe+2HCl->FeCl2+H2
0,125---0,25--0,125----0,125---
n Fe=11.2\56=0,2 mol
n HCl=0,25.1=0,25 mol
=> lập tỉ lệ : 0,2\1>0,25\2
=>HCl hết
=>VH2=0,125.22,4=2,8l
=>m Fe=0,125.56=7g
\(n_{Fe}=\dfrac{m}{M}=\dfrac{11,2}{56}=0,2\left(mol\right)\)
\(n_{HCl}=CM.V_{dd}=1.0,25=0,25\left(mol\right)\)
PTHH:\(2Fe+6HCl\rightarrow2FeCl_3+3H_2\)
TPƯ: 0,2 0,25
PƯ: 0,08 0,25 0,08 0,125
SPƯ: 0,12 0 0,08 0,125
\(V_{H_2}=n.22,4=0,125.22,4=2,8\left(l\right)\)
\(m_{Fedư}=n.M=0,12.56=6,72\left(g\right)\)