Cho 5,6g Fe tác dụng 100ml dung dịch HCl (đktc)
a. Tính khối lượng muối thu được
b. Tính thể tích khí sinh ra, nồng độ mol dung dịch HCl
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\(a)n_{Fe}=\dfrac{5,6}{56}=0,1mol\\
n_{HCl}=0,5.1=0,5mol\\
Fe+2HCl\rightarrow FeCl_2+H_2\\
\Rightarrow\dfrac{0,1}{1}< \dfrac{0,5}{2}\Rightarrow HCl.dư\\
Fe+2HCl\rightarrow FeCl_2+H_2\)
0,1 0,2 0,1 0,1
\(m_{HCl\left(dư\right)}=\left(0,5-0,2\right).36,5=10,95g\\ b)m_{FeCl_2}=0,1.127=12,7g\\ c)V_{H_2}=0,1.22,4=2,24l\\ d)C_{\%HCl\left(dư\right)}=\dfrac{10,95}{200}\cdot100=5,475\%\\ C_{\%HCl\left(pư\right)}=\dfrac{0,2.36,5}{200}\cdot100=3,65\%\)
\(Pt: Fe + 2HCl \rightarrow FeCl_2 + H_2\)
\(a.n_{Fe}=\dfrac{11,2}{56}=0,2\left(mol\right)\)
Theo pt: \(nH_2 = nFe = 0,2 mol\)
\(\Rightarrow V_{H_2}=0,2.22,4=4,48l\)
\(b.n_{FeCl_2}=n_{Fe}=0,2\left(mol\right)\)
\(\Rightarrow m_{FeCl_2}=0,2.127=25.4g\)
\(c.n_{HCl}=2nFe=0,4mol\)
\(C_MHCl=\dfrac{0,4}{0,1}=4M\)
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
\(n_{Zn}=\dfrac{9,75}{65}=0,15mol\)
\(Zn+2HCl\rightarrow ZnCl_2+H_2\)
0,15 0,3 0,15 0,15
\(m_{ZnCl_2}=0,15\cdot136=20,4\left(g\right)\)
\(V_{H_2}=0,15\cdot22,4=3,36\left(l\right)\)
\(C_{M_{HCl}}=\dfrac{0,3}{0,1}=3M\)
a) CaCO3 + 2HCl --> CaCl2 + CO2 + H2O
b) \(n_{CaCO_3}=\dfrac{10}{100}=0,1\left(mol\right)\)
CaCO3 + 2HCl --> CaCl2 + CO2 + H2O
_0,1---->0,2------->0,1----->0,1
=> mCaCl2 = 0,1.111 = 11,1 (g)
=> VCO2 = 0,1.22,4 = 2,24 (l)
c) \(a=C_{M\left(HCl\right)}=\dfrac{0,2}{0,4}=0,5M\)
d) \(C_{M\left(CaCl_2\right)}=\dfrac{0,1}{0,4}=0,25M\)
\(Fe+2HCl\rightarrow FeCl_2+H_2\)
\(n_{Fe}=0,1\left(mol\right)\)
a, \(m_{FeCl_2}=0,1.\left(56+35,5.2\right)=12,7\left(g\right)\)
b, \(V_{H_2}=0,1.22,4=2,24\left(l\right)\)
\(n_{Al}=\dfrac{2,7}{27}=0,1\left(mol\right)\\ PTHH:2Al+6HCl\rightarrow2AlCl_3+3H_2\\ n_{AlCl_3}=n_{Al}=0,1\left(mol\right)\\ a,m_{AlCl_3}=133,5.0,1=13,35\left(g\right)\\ n_{H_2}=\dfrac{3}{2}.0,1=0,15\left(mol\right)\\ b,V_{H_2\left(đktc\right)}=0,15.22,4=3,36\left(l\right)\\ c,n_{HCl}=\dfrac{6}{2}.0,1=0,3\left(mol\right)\\ c,C_{MddHCl}=\dfrac{0,3}{0,2}=1,5\left(M\right)\)
a,\(n_{Fe}=\dfrac{5,6}{56}=0,1\left(mol\right)\)
PTHH: Fe + H2SO4 → FeSO4 + H2
Mol: 0,1 0,1 0,1 0,1
b,\(V_{H_2}=0,1.22,4=2,24\left(l\right)\)
c,\(C_{M_{ddH_2SO_4}}=\dfrac{0,1}{0,2}=0,5M\)
d,\(C_{M_{ddFeSO_4}}=\dfrac{0,1}{0,2}=0,5M\)
\(nFe=\dfrac{5,6}{56}=0,1\left(mol\right)\)
\(Fe+2HCl\rightarrow FeCl_2+H_2\)
1 2 1 1 (mol)
0,1 0,2 0,1 0,1 (mol)
m muối là mFeCl2
=> \(mFeCl_2=0,1.127=12,7\left(g\right)\)
\(VH_2=0,1.22,4=2,24\left(l\right)\)
\(VHCl=100ml=0,1\left(l\right)\)
\(CM_{HCl}=\dfrac{nHCl}{VHCl}=\dfrac{0,2}{0,1}=2M\)