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\(n_{Fe}=\dfrac{11.2}{56}=0.2\left(mol\right)\)
a: \(Fe+2HCl\rightarrow FeCl_2+H_2\)
0,2 0,2
b: V=0,2*22,4=4,48(lít)
PTHH: \(Zn+2HCl\rightarrow ZnCl_2+H_2\uparrow\)
Ta có: \(n_{Zn}=\dfrac{9,75}{65}=0,15\left(mol\right)\)
\(\Rightarrow\left\{{}\begin{matrix}n_{HCl}=0,3\left(mol\right)\\n_{ZnCl_2}=0,15\left(mol\right)=n_{H_2}\end{matrix}\right.\) \(\Rightarrow\left\{{}\begin{matrix}V_{H_2}=0,15\cdot22,4=3,36\left(l\right)\\m_{ZnCl_2}=0,15\cdot136=20,4\left(g\right)\\C_{M_{HCl}}=\dfrac{0,3}{0,2}=1,5\left(M\right)\end{matrix}\right.\)
\(n_{Zn}=\dfrac{9,75}{65}=0,15\left(mol\right)\)
PT: \(Zn+2HCl\rightarrow ZnCl_2+H_2\)
a, \(n_{H_2}=n_{Zn}=0,15\left(mol\right)\Rightarrow V_{H_2}=0,15.24,79=3,7185\left(l\right)\)
b, \(n_{HCl}=2n_{Zn}=0,3\left(mol\right)\Rightarrow m_{ddHCl}=\dfrac{0,3.36,5}{25\%}=43,8\left(g\right)\)
c, \(Ba\left(OH\right)_2+2HCl\rightarrow BaCl_2+2H_2O\)
Theo PT: \(n_{Ba\left(OH\right)_2}=\dfrac{1}{2}n_{HCl}=0,15\left(mol\right)\)
\(\Rightarrow V_{Ba\left(OH\right)_2}=\dfrac{0,15}{2,5}=0,06\left(l\right)\)
\(n_{Mg}=\dfrac{4,8}{24}=0,2\left(mol\right)\)
PT: \(Mg+2HCl\rightarrow MgCl_2+H_2\)
a, \(n_{H_2}=n_{Mg}=0,2\left(mol\right)\Rightarrow V_{H_2}=0,2.24,79=4,958\left(l\right)\)
b, \(n_{HCl}=2n_{Mg}=0,4\left(mol\right)\Rightarrow m_{ddHCl}=\dfrac{0,4.36,5}{20\%}==73\left(g\right)\)
c, \(Ba\left(OH\right)_2+2HCl\rightarrow BaCl_2+2H_2O\)
Theo PT: \(n_{Ba\left(OH\right)_2}=\dfrac{1}{2}n_{HCl}=0,2\left(mol\right)\)
\(\Rightarrow V_{Ba\left(OH\right)_2}=\dfrac{0,2}{2,5}=0,08\left(l\right)\)
\(n_{Mg}=\dfrac{3,6}{24}=0,15\left(mol\right)\)
PT: \(Mg+2HCl\rightarrow MgCl_2+H_2\)
a, \(n_{H_2}=n_{Mg}=0,15\left(mol\right)\Rightarrow V_{H_2}=0,15.24,79=3,7185\left(l\right)\)
b, \(n_{HCl}=2n_{Mg}=0,3\left(mol\right)\Rightarrow m_{ddHCl}=\dfrac{0,3.36,5}{25\%}=43,8\left(g\right)\)
c, PT: \(Ba\left(OH\right)_2+2HCl\rightarrow BaCl_2+2H_2O\)
Theo PT: \(n_{Ba\left(OH\right)_2}=\dfrac{1}{2}n_{HCl}=0,15\left(mol\right)\)
\(\Rightarrow V_{Ba\left(OH\right)_2}=\dfrac{0,15}{2,5}=0,06\left(l\right)\)
nMg=4,824=0,2(mol)nMg=4,824=0,2(mol)
PTHH: Mg + H2SO4 → MgSO4 + H2
Mol: 0,2 0,2
VH2=0,2.24,79=4,958(l)
=> đáp án 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
\(V_{H_2}=0,1.24,79=2,479\left(l\right)\)
\(C_{M_{ddH_2SO_4}}=\dfrac{0,1}{0,2}=0,5M\)
\(C_{M_{ddFeSO_4}}=\dfrac{0,1}{0,2}=0,5M\)
Ở đkc, 1 mol khí chiếm thể tích 24,79 lít
\(n_{Fe}=\dfrac{11,2}{56}=0,2\left(mol\right)\\ PTHH:Fe+2HCl\rightarrow FeCl_2+H_2\\ \Rightarrow n_{H_2}=n_{Fe}=0,2\left(mol\right)\\ \Rightarrow V_{H_2\left(đkc\right)}=24,79\cdot0,2=4,958\left(l\right)\)