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a,\(n_{Fe}=\dfrac{11,2}{56}=0,2\left(mol\right)\)
PTHH: Fe + 2HCl → FeCl2 + H2
Mol: 0,2 0,4 0,2
b, \(V_{H_2}=0,2.22,4=4,48\left(l\right)\)
c, \(m_{HCl}=0,4.36,5=14,6\left(g\right)\)
\(n_{Fe}=\dfrac{11.2}{56}=0.2\left(mol\right)\)
\(Fe+2HCl\rightarrow FeCl_2+H_2\)
\(0.2.......0.4....................0.2\)
\(V_{H_2}=0.2\cdot22.4=4.48\left(l\right)\)
\(m_{HCl}=0.4\cdot36.5=14.6\left(g\right)\)
PTHH : \(Fe+2HCl-->FeCl_2+H_2\uparrow\) (1)
\(n_{Fe}=\dfrac{m}{M}=\dfrac{11.2}{56}=0.2\left(mol\right)\)
Từ (1) => \(n_{Fe}=n_{H_2}=0.2\left(mol\right)\)
=> \(V_{H2\left(đktc\right)}=n.22,4=0,2.22,4=4,48\left(l\right)\)
Từ (1) => \(2n_{Fe}=n_{HCl}=0.4\left(mol\right)\)
=> \(m_{HCl}=n.M=0,4.\left(1+35.5\right)=14.6\left(g\right)\)
\(a) Fe + 2HCl \to FeCl_2 + H_2\\ b) n_{H_2} = n_{Fe} = \dfrac{8,4}{56} = 0,15(mol)\\ V_{H_2} = 0,15.22,4 = 3,36(lít)\\ n_{HCl} = 2n_{H_2} = 0,3(mol)\ m_{HCl} = 0,3.36,5 = 10,95(gam)\)
\(n_{Fe}=\dfrac{8.4}{56}=0.15\left(mol\right)\)
\(Fe+2HCl\rightarrow FeCl_2+H_2\)
\(0.15......0.3..................0.15\)
\(m_{HCl}=0.3\cdot36.5=10.95\left(g\right)\)
\(V_{H_2}=0.15\cdot22.4=3.36\left(l\right)\)
nFe = 16,8/56 = 0,3 (mol)
PTHH: Fe + 2HCl -> FeCl2 + H2
Mol: 0,3 ---> 0,6 ---> 0,3 ---> 0,3
VH2 = 0,3 . 24,79 = 7,437 (l)
mHCl = 0,6 . 36,5 = 21,9 (g)
PTHH: CuO + H2 -> (t°) Cu + H2O
Mol: 0,3 <--- 0,3 ---> 0,3
mCu = 0,3 . 64 = 19,2 (g)
mFe = 16,8: 56 =0,3(mol)
pthh : Fe + 2HCl --> FeCl2 + H2 (1)
0,3 ->0,6-----------------> 0,3 (mol)
=> VH2 (đkc) = 0,3 . 24,79 ( l)
=> mHCl = 0,6 . 35,5 = 21,9 (g)
pthh : CuO + H2 -t--> Cu+ H2O
0,3<-----0,3 (mol)
=>mCu = 0,3 . 64 = 19,2 (g)
\(nAl=\dfrac{13,5}{27}=0,5\left(mol\right)\)
\(2Al+6HCl\rightarrow2AlCl_3+3H_2\)
2 6 2 3 (mol)
0,5 1,5 0,5 0,75 (mol)
a. \(VH_2=0,75.22,4=16,8\left(l\right)\)
b.
\(FeO+H_2\rightarrow Fe+H_2O\)
1 1 1 1 (mol)
0,75 0,75 0,75 0,75
\(m_{Fe}=0,75.42\left(g\right)\)
\(a) Fe + 2HCl \to FeCl_2 + H_2\\ n_{FeCl_2} = n_{H_2} = n_{Fe} = \dfrac{5,6}{56} = 0,1(mol)\\ V_{H_2} = 0,1.22,4 = 2,24(lít)\\ b)m_{FeCl_2} = 0,1.127 = 12,7(gam)\\ c) n_{HCl} =2 n_{Fe} = 0,2(mol)\\ C_{M_{HCl}} = \dfrac{0,2}{0,2} = 1M\)
\(n_{Fe}=\dfrac{5.6}{56}=0.1\left(mol\right)\)
\(Fe+2HCl\rightarrow FeCl_2+H_2\)
\(0.1......0.2..........0.1..........0.1\)
\(V_{H_2}=0.1\cdot22.4=2.24\left(l\right)\)
\(m_{FeCl_2}=0.1\cdot127=12.7\left(g\right)\)
\(C_{M_{HCl}}=\dfrac{0.2}{0.2}=1\left(M\right)\)
a, \(Fe+2HCl\rightarrow FeCl_2+H_2\)
b, \(n_{Fe}=\dfrac{3,36}{56}=0,06\left(mol\right)\)
Theo PT: \(n_{H_2}=n_{Fe}=0,06\left(mol\right)\Rightarrow V_{H_2}=0,06.22,4=1,344\left(l\right)\)
c, \(n_{Fe_2O_3}=\dfrac{4}{160}=0,025\left(mol\right)\)
PT: \(Fe_2O_3+3H_2\underrightarrow{t^o}2Fe+3H_2O\)
Xét tỉ lệ: \(\dfrac{0,025}{1}>\dfrac{0,06}{3}\), ta được Fe2O3 dư.
Theo PT: \(n_{Fe_2O_3\left(pư\right)}=\dfrac{1}{3}n_{H_2}=0,02\left(mol\right)\Rightarrow n_{Fe_2O_3\left(dư\right)}=0,025-0,02=0,005\left(mol\right)\)
\(\Rightarrow m_{Fe_2O_3\left(dư\right)}=0,005.160=0,8\left(g\right)\)
a) \(Fe+2HCl\rightarrow FeCl_2+H_2\)
b) \(n_{Fe}=\dfrac{11,2}{56}=0,2\left(mol\right)\)
Theo PTHH: \(n_{HCl}=2n_{Fe}=0,4\left(mol\right)\)
\(\Rightarrow m_{HCl}=0,4.36,5=14,6\left(g\right)\)
c) Theo PTHH: \(n_{FeCl_2}=n_{H_2}=n_{Fe}=0,2\left(mol\right)\)
\(\Rightarrow m_{FeCl_2}=0,2.127=25,4\left(g\right)\)
d) \(V_{H_2}=0,2.22,4=4,48\left(l\right)\)
e) \(n_{CuO}=\dfrac{24}{80}=0,3\left(mol\right)\)
PTHH: \(CuO+H_2\xrightarrow[]{t^o}Cu+H_2O\)
Xét tỉ lệ: \(\dfrac{0,3}{1}>\dfrac{0,2}{1}\Rightarrow CuO\) dư
Theo PTHH: \(n_{Cu}=n_{H_2}=0,2\left(mol\right)\)
\(\Rightarrow m_{Cu}=0,2.64=12,8\left(g\right)\)