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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) \(V_{H_2}=0,25.22,4=5,6\left(l\right)\)
\(PTHH:4Al+6HCl\rightarrow2Al_2Cl_3+3H_2\uparrow\)
\(n_{Al}=\frac{3,78}{27}=0,14\left(mol\right)\)
\(\Rightarrow n_{H_2}=\frac{3}{4}n_{Al}=0,105\left(mol\right)\)
\(V_{H_2}=0,105.22,4=2,352\left(l\right)\)
\(n_{HCl}=\frac{3}{2}n_{Al}=\frac{3}{2}.0,14=0,21\left(mol\right)\)
\(C_{M_{ddHCl}}=\frac{0,21}{0,2}=1,05\left(M\right)\)
\(n_{Al_2Cl_3}=\frac{1}{2}n_{Al}=\frac{1}{2}.0,14=0,07\left(mol\right)\)
\(m_{Al_2Cl_3}=0,07.160,5=11,235\left(g\right)\)
a) $CaSO_3 + 2HCl \to CaCl_2 + SO_2 + H_2O$
b)
$n_{SO_2} = n_{CaSO_3} = \dfrac{12}{120} = 0,1(mol)$
$m_{SO_2} = 0,1.64 = 6,4(gam)$
c)
$n_{HCl} = 2n_{SO_2} = 0,2(mol)$
$\Rightarrow m_{dd\ HCl} = \dfrac{0,2.36,5}{14,6\%} = 50(gam)$
d)
$m_{dd\ sau\ pư} = m_{CaSO_3} + m_{dd\ HCl} - m_{SO_2} = 12 + 50 - 6,4 = 55,6(gam)$
$C\%_{CaCl_2} = \dfrac{0,1.111}{55,6}.100\% = 19,96\%$
Ta có: \(n_{CaSO_3}=\dfrac{12}{120}=0,1\left(mol\right)\)
a. PTHH: CaSO3 + 2HCl ---> CaCl2 + H2O + SO2
b. Theo PT: \(n_{SO_2}=n_{CaSO_3}=0,1\left(mol\right)\)
=> \(m_{SO_2}=0,1.64=6,4\left(g\right)\)
c. Theo PT: \(n_{HCl}=2.n_{CaSO_3}=2.0,1=0,2\left(mol\right)\)
=> \(m_{HCl}=0,2.36,5=7,3\left(g\right)\)
Ta có: \(C_{\%_{HCl}}=\dfrac{7,3}{m_{dd_{HCl}}}.100\%=14,6\%\)
=> \(m_{dd_{HCl}}=50\left(g\right)\)
d. Ta có: \(m_{dd_{CaCl_2}}=12+50-0,1.64=55,6\left(g\right)\)
Theo PT: \(n_{CaCl_2}=n_{SO_2}=0,1\left(mol\right)\)
=> \(m_{CaCl_2}=0,1.111=11,1\left(g\right)\)
=> \(C_{\%_{CaCl_2}}=\dfrac{11,1}{55,6}.100\%=19,96\%\)
\(n_{Zn}=\dfrac{4,55}{65}=0,07(mol)\\ Zn+2HCl\to ZnCl_2+H_2\\ a,n_{HCl}=0,14(mol)\\ \Rightarrow C_{M_{HCl}}=\dfrac{0,14}{0,2}=0,7M\\ b,n_{H_2}=0,07(mol)\\ \Rightarrow V_{H_2}=0,07.22,4=1,568(l)\\ c,n_{ZnCl_2}=0,07(mol)\\ \Rightarrow m_{ZnCl_2}=0,07.136=9,52(g)\\ c,ZnCl_2+2AgNO_3\to 2AgCl\downarrow+Zn(NO_3)_2\)
\(m_{dd_{ZnCl_2}}=200.0,8+4,55-0,07.2=164,41(g)\\ n_{AgCl}=0,14(mol);n_{Zn(NO_3)_2}=0,07(mol)\\ \Rightarrow C\%_{Zn(NO_3)_2}=\dfrac{0,07.189}{164,41+200-0,14.143,5}.100\%=3,84%\)
\(n_{Fe}=\dfrac{11,2}{56}=0,2\left(mol\right)\)
a) PTHH : \(Fe+H_2SO_4\rightarrow FeSO_4+H_2\)
Theo Pt : \(n_{Fe}=n_{H2SO4}=n_{FeSO4}=n_{H2}=0,2\left(mol\right)\)
b) \(V_{H2\left(dktc\right)}=0,2.22,4=4,48\left(l\right)\)
c) \(C_{MddH2SO4}=\dfrac{0,2}{0,2}=1\left(M\right)\)
d) \(m_{muối}=m_{FeSO4}=0,2.152=30,4\left(g\right)\)
a) $Zn + 2HCl \to ZnCl_2 + H_2$
b) Theo PTHH : $n_{H_2} = n_{Zn} = \dfrac{16,25}{65} = 0,25(mol)$
$\Rightarrow V_{H_2} = 0,25.22,4 = 5,6(lít)$
c) $n_{HCl} = 2n_{Zn} = 0,5(mol)$
$\Rightarrow C_{M_{HCl}} = \dfrac{0,5}{0,5} = 1M$