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\(n_{FeCl_2}=0,6.0,2=0,12(mol)\\ FeO+2HCl \to FeCl_2+H_2O\\ n_{FeO}=n_{FeCl_2}=0,12(mol)\\ m_{FeO}=0,12.72=8,6(g)\)
Bài 6:
\(n_{Fe\left(OH\right)_3}=\dfrac{21,4}{107}=0,2\left(mol\right)\)
PT: \(Fe\left(OH\right)_3+3HCl\rightarrow FeCl_3+3H_2O\)
_______0,2________0,6______0,2 (mol)
a, \(C\%_{HCl}=\dfrac{0,6.36,5}{200}.100\%=10,95\%\)
b, \(C\%_{FeCl_3}=\dfrac{0,2.162,5}{21,4+200}.100\%\approx14,68\%\)
Bài 7:
\(m_{H_2SO_4}=100.9,8\%=9,8\left(g\right)\Rightarrow n_{H_2SO_4}=\dfrac{9,8}{98}=0,1\left(mol\right)\)
PT: \(ZnO+H_2SO_4\rightarrow ZnSO_4+H_2O\)
______0,1______0,1_______0,1 (mol)
a, \(m_{ZnO}=0,1.81=8,1\left(g\right)\)
b, \(C\%_{ZnSO_4}=\dfrac{0,1.161}{8,1+100}.100\%\approx14,89\%\)
nH2=13,14:22,4=0,6 mol
PTHH: 2Al+6HCl=>2Al2Cl3+3H2
0,4<-1,2<----0,4<-----0,6
=> Al=0,4.27=10,8g
CMHCL=1,2:0,4=3M
CM Al2Cl3=0,4:0,4=1M
bài 2: nH2=0,2mol
PTHH: 2A+xH2SO4=> A2(SO4)x+xH2
0,4:x<---------------------------0,2
ta có PT: \(\frac{13}{A}=\frac{0,4}{x}\)<=> 13x=0,4A
=> A=32,5x
ta lập bảng xét
x=1=> A=32,5 loiaj
x=2=> A=65 nhận
x=3=> A=97,5 loại
=> A là kẽm (Zn)
\(n_{HCl}=0.1\cdot1=0.1\left(mol\right)\)
\(MgO+2HCl\rightarrow MgCl_2+H_2O\)
\(0.05...........0.1\)
\(m_{MgO}=0.05\cdot24=1.2\left(g\right)\)
\(MgO+2HCl \to MgCl_2+H_2O\\ n_{HCl}=0,1(mol)\\ n_{MgO}=0,05(mol)\\ m_{MgO}=0,05.40=2(g)\\ \to A\)
Bài 1:
a. Zn + 2HCl -> ZnCl2 + H2
b. CuO + 2HCl -> CuCl2 + H2O
c. Ba(OH)2 + 2HCl - > BaCl2 + 2H2O
d. Fe(OH)3 + 3HCl -> FeCl3 + 3H2O
B1:
\(a,Zn+2HCl\rightarrow ZnCl_2+H_2\\ b,CuO+2HCl\rightarrow CuCl_2+H_2O\\ c,Ba\left(OH\right)_2+2HCl\rightarrow BaCl_2+2H_2O\\d, Fe\left(OH\right)_3+3HCl\rightarrow FeCl_3+3H_2O\)
B2:
\(n_{Mg}=\dfrac{2,4}{24}=0,1\left(mol\right)\\ n_{HCl}=0,1.3=0,3\left(mol\right)\\ a,Mg+2HCl\rightarrow MgCl_2+H_2\\ Vì:\dfrac{0,1}{1}< \dfrac{0,3}{2}\Rightarrow HCldư\\ b,n_{H_2}=n_{MgCl_2}=n_{Mg}=0,1\left(mol\right)\\ n_{HCl\left(dư\right)}=0,3-0,1.2=0,1\left(mol\right)\\ b,V_{H_2\left(đktc\right)}=0,1.22,4=2,24\left(l\right)\\ c,C_{MddMgCl_2}=\dfrac{0,1}{0,1}=1\left(M\right)\\ C_{MddHCl\left(dư\right)}=\dfrac{0,1}{0,1}=1\left(M\right)\)
250ml=0,25l
\(MgO+2HCl\rightarrow MgCl_2+H_2O\)
0.2.........0.4..........0,2............0,2 (mol)
a)
\(n_{MgO}=\dfrac{8}{40}=0,2\left(mol\right)\)
\(m_{MgCl_2}=0,2.95=19\left(g\right)\)
b)
\(C_{M_{HCl}}=\dfrac{0,4}{0,25}=1,6\left(M\right)\)
a/ \(n_{MgO}=\dfrac{8}{40}=0,2\left(mol\right)\)
PTHH: MgO + 2HCl → MgCl2 + H2O
Mol: 0,2 0,4 0,2
\(m_{MgCl_2}=0,2.95=19\left(g\right)\)
b/ \(C_{M_{ddHCl}}=\dfrac{0,4}{0,25}=1,6M\)
PTHH: \(FeO+2HCl\rightarrow FeCl_2+H_2O\)
Ta có: \(n_{FeCl_2}=0,2\cdot0,6=0,12\left(mol\right)=n_{FeO}\) \(\Rightarrow m_{FeO}=0,12\cdot72=8,64\left(g\right)\)