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\(n_{H_2}=\dfrac{14,874}{24,79}=0,6\left(mol\right)\)
PT: \(Fe+2HCl\rightarrow FeCl_2+H_2\)
0,6 1,2 0,6 (mol)
a, mFe = 0,6.56 = 33,6 (g)
b, mHCl = 1,2.36,5 = 43,8 (g)
\(n_{H_2}=\dfrac{14,874}{24,79}=0,6\left(mol\right)\)
PT: \(2Al+6HCl\rightarrow2AlCl_3+3H_2\)
a, \(n_{Al}=\dfrac{2}{3}n_{H_2}=0,4\left(mol\right)\Rightarrow m_{Al}=0,4.27=10,8\left(g\right)\)
b, \(n_{HCl}=2n_{H_2}=1,2\left(mol\right)\Rightarrow m_{HCl}=1,2.36,5=43,8\left(g\right)\)
\(n_{H_2}=\dfrac{14,874}{24,79}=0,6\left(mol\right)\)
PTHH :
\(2Al+6HCl\rightarrow2AlCl_3+3H_2\uparrow\)
0,4 1,2 0, 4 0,6
\(m_{Al}=0,4.27=10,8\left(g\right)\)
\(m_{HCl}=1,2.36,5=43,8\left(g\right)\)
Ta có: \(n_{H_2}=\dfrac{74,37}{24,79}=3\left(mol\right)\)
PT: \(2Al+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2\)
a, \(n_{Al}=\dfrac{2}{3}n_{H_2}=2\left(mol\right)\)
\(\Rightarrow m_{Al}=2.27=54\left(g\right)\)
b, \(n_{H_2SO_4}=n_{H_2}=3\left(mol\right)\)
\(\Rightarrow m_{H_2SO_4}=3.98=294\left(g\right)\)
\(Fe + 2HCl \to FeCl_2 + H_2\\ n_{Fe} = n_{FeCl_2} = n_{H_2} = \dfrac{8,96}{22,4} = 0,4(mol)\\ m_{Fe} = 0,4.56 = 22,4(gam)\\ m_{FeCl_2} = 0,4.127 = 50,8(gam)\)
\(n_{Fe} =\dfrac{11,2}{56} = 0,2(mol)\\ \)
Fe + 2HCl → FeCl2 + H2
0,2.....0,4.........0,2........0,2..............(mol)
Vậy :
V = 0,2.22,4 = 4,48(lít)
\(m_{FeCl_2} = 0,2.127=25,4(gam)\)
\(m_{HCl} = 0,4.36,5 = 14,6(gam)\)
PTHH: Fe+2HCl → FeCl2+H2
a, nFe=m:M=11,2:56=0,2 mol
Theo PTHH, nFe=nH2=0,2 mol
VH2=n.22,4=0,2.22,4=4,48 lít
b, Theo PTHH, nFeCl2=nFe=0,2
mFeCl2=n.M=0,2.127=25,4 g
c,
Theo PTHH, nHCl=2nFe=0,4 mol
mHCl=n.M=0,4.36,5=14,6 g
Fe + 2HCl \(\rightarrow FeCl_2+H_2\)
a) nFe = \(\dfrac{5,6}{56}=0,1mol\)
Theo pt nH2 = nFe = 0,1 mol
=> VH2 = 0,1.22,4 = 2,24 lít
b) Theo pt: nFeCl2 = nFe = 0,1 mol
=> mFeCl2 = 0,1.127 = 12,7g
c) Theo pt : nHCl = 2nFe = 0,2 mol
=> mHCl = 0,2.36,5 = 7,3g
a,\(n_{Fe}=\dfrac{11,2}{56}=0,2\left(mol\right);n_{H_2}=\dfrac{3,36}{22,4}=0,15\left(mol\right)\)
PTHH: Fe + 2HCl → FeCl2 + H2
Mol: 0,15 0,3
Ta có: \(\dfrac{0,2}{1}>\dfrac{0,15}{1}\) ⇒ H2 pứ hết,Fe dư
\(V_{H_2}=3,36\left(l\right)\) (đề cho)
b, ko tính đc k/lg dd ,chỉ tính đc thể tích dd
\(V_{ddHCl}=\dfrac{0,2}{1}=0,2\left(l\right)=200\left(ml\right)\)
Fe + 2HCl -> FeCl2 + H2
nFe = 5,6/56 = 0,1 mol
=>nH2 = 0,1 mol
=> VH2= 0,1*22,4= 2,24 lít
\(n_{Fe}=\dfrac{5,6}{56}=0,1\left(mol\right)\)
PTHH: Fe + 2HCl ---> FeCl2 + H2
0,1-->0,2------------------>0,1
=> \(\left\{{}\begin{matrix}m_{ddHCl}=\dfrac{0,2.36,5}{15\%}=\dfrac{146}{3}\left(g\right)\\V_{H_2}=0,1.22,4=4,48\left(l\right)\end{matrix}\right.\)
\(a,n_{H_2}=\dfrac{14,874}{24,79}=0,6mol\\ Fe+2HCl\rightarrow FeCl_2+H_2\\ n_{H_2}=n_{Fe}=0,6mol\\ m_{Fe}=0,6.56=33,6g\\ b.n_{HCl}=0,6.2=1,2mol\\ m_{HCl}=1,2.36,5=43,8g\)