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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) => \(2n_{Fe}=n_{HCl}=0.4\left(mol\right)\)
=> \(m_{HCl}=n.M=0,4.\left(1+35.5\right)=14.6\left(g\right)\)
Bài 1:
1) Fe + 2HCl --> FeCl2 + H2
2) \(n_{Fe}=\dfrac{16,8}{56}=0,3\left(mol\right)\)
PTHH: Fe + 2HCl --> FeCl2 + H2
_____0,3--------------->0,3--->0,3
=> nH2 = 0,3.22,4 = 6,72(l)
3) mFeCl2 = 0,3.127=38,1(g)
Bài 2
1) 2Al + 3H2SO4 --> Al2(SO4)3 + 3H2
2) \(n_{H_2}=\dfrac{6,72}{22,4}=0,3\left(mol\right)\)
PTHH: 2Al + 3H2SO4 --> Al2(SO4)3 + 3H2
______0,2<----------------------------------0,3
=> mAl = 0,2.27 = 5,4(g)
\(n_{Fe}=\dfrac{11,2}{56}=0,2(mol)\\ a,Fe+2HCl\to FeCl_2+H_2\\ b,n_{FeCl_2}=n_{H_2}=n_{Fe}=0,2(mol)\\ \Rightarrow V_{H_2}=0,2.22,4=4,48(l)\\ m_{FeCl_2}=0,2.127=25,4(g)\)
\(Fe+2HCl\rightarrow FeCl_2+H_2\\ n_{Fe}=\dfrac{14}{56}=0,25\left(mol\right)\\ n_{H_2}=n_{Fe}=0,25\left(mol\right)\\ V_{H_2}=0,25.22,4=5,6\left(l\right)\\ n_{HCl}=2n_{Fe}=0,5\left(mol\right)\\ m_{HCl}=0,5.36,5=18,25\left(g\right)\)
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) Có khí thoát ra
Fe + 2HCl --> FeCl2 + H2
b)
Theo ĐLBTKL: mFe + mHCl = mFeCl2 + mH2
=> mHCl = 25,4 + 0,4 - 11,2 = 14,6(g)