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a, PT: \(Mg+2HCl\rightarrow MgCl_2+H_2\)
\(MgCl_2+2NaOH\rightarrow2NaCl+Mg\left(OH\right)_{2\downarrow}\)
\(Mg\left(OH\right)_2\underrightarrow{t^o}MgO+H_2O\)
b, Ta có: \(n_{Mg}=\dfrac{9,6}{24}=0,4\left(mol\right)\)
Theo PT: \(n_{HCl}=2n_{Mg}=0,8\left(mol\right)\)
\(\Rightarrow C_{M_{HCl}}=\dfrac{0,8}{0,2}=4\left(M\right)\)
c, Theo PT: \(n_{MgO}=n_{Mg}=0,4\left(mol\right)\)
\(\Rightarrow m_{MgO}=0,4.40=16\left(g\right)\)
a) FeO + 2 HCl -> FeCl2 + H2O
FeCl2 + 2 NaOH -> Fe(OH)2 (kết tủa) + 2 NaCl
m(rắn)=m(kt)=mFe(OH)2=24(g)
=> nFe(OH)2= 24/90= 8/45 (mol)
=> nFeO=nFeCl2=nFe(OH)2= 8/45(mol)
=>m=mFeO=8/45 . 72=12,8(g)
nHCl=2.nFeCl2=2.nFe(OH)2=2. 8/45 = 16/45(mol)
-> VddHCl= (16/45)/ 1= 16/45 (l)= 355,556(ml)
a, \(Zn+2HCl\rightarrow ZnCl_2+H_2\)
Ta có: \(n_{Zn}=\dfrac{13}{65}=0,2\left(mol\right)\)
Theo PT: \(n_{ZnCl_2}=n_{H_2}=n_{Zn}=0,2\left(mol\right)\)
\(\Rightarrow V_{H_2}=0,2.24,79=4,958\left(l\right)\)
b, \(n_{HCl}=2n_{Zn}=0,4\left(mol\right)\Rightarrow V_{HCl}=\dfrac{0,4}{2}=0,2\left(l\right)\)
c, \(C_{M_{ZnCl_2}}=\dfrac{0,2}{0,2}=1\left(M\right)\)
\(n_{H_2}=\dfrac{2,24}{22,4}=0,1mol\)
a)\(Fe+2HCl\rightarrow FeCl_2+H_2\)
0,1 0,1 0,1
\(m_{Fe}=0,1\cdot56=5,6\left(g\right)\)
b)\(\Rightarrow\%m_{Fe}=\dfrac{5,6}{12}\cdot100\%=46,67\%\) \(\Rightarrow\%m_{Cu}=100\%-46,67\%=53,33\%\)
c)\(n_{NaOH}=0,1\cdot1=0,1mol\)
\(2NaOH+FeCl_2\rightarrow Fe\left(OH\right)_2+2NaCl\)
0,1 0,1 0,1
\(m_{Fe\left(OH\right)_2}=0,1\cdot90=9\left(g\right)\)
\(MgCO_3+2HCl\rightarrow MgCl_2+H_2O+CO_2\)
\(CO_2+Na\left(OH\right)_2\rightarrow CaCO_3+H_2O\)
b. \(n_{MgCO_3}=\dfrac{21}{84}=0,25mol\) \(\Rightarrow n_{HCl}=2.0,25=0,5mol\)
\(V_{ddHCl}=\dfrac{0,5}{2}=0,25l\)
c. \(n_{CO_2}=n_{MgCO_3}=0,25mol\)
\(n_{CaCO_3}=n_{CO_2}=0,25mol\)
\(\Rightarrow m_{CaCO_3}=0,25.100=25g\)