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a) nFe=0,1(mol); nHCl=0,4(mol)
PTHH: Fe + 2 HCl -> FeCl2 + H2
Ta có: 0,1/1 < 0,4/2
=> Fe hết, HCl dư, tish theo nFe.
b) nH2=nFeCl2=Fe=0,1(mol)
=> V(H2,đktc)=0,1.22,4=2,24(l)
c) mFeCl2=127.0,1=12,7(g)
a) nFe=0,1(mol); nHCl=0,4(mol) PTHH: Fe + 2 HCl -> FeCl2 + H2 Ta có: 0,1/1 < 0,4/2 => Fe hết, HCl dư, tish theo nFe. b) nH2=nFeCl2=Fe=0,1(mol) => V(H2,đktc)=0,1.22,4=2,24(l) c) mFeCl2=127.0,1=12,7(g)
PTHH: \(Fe+2HCl\rightarrow FeCl_2+H_2\uparrow\)
Ta có: \(n_{H_2}=\dfrac{3,36}{22,4}=0,15\left(mol\right)\)
\(\Rightarrow\left\{{}\begin{matrix}n_{HCl}=0,3\left(mol\right)\\n_{FeCl_2}=n_{Fe}=0,15\left(mol\right)\end{matrix}\right.\) \(\Rightarrow\left\{{}\begin{matrix}m_{HCl}=0,3\cdot36,5=10,95\left(g\right)\\m_{Fe}=0,15\cdot56=8,4\left(g\right)\\m_{FeCl_2}=0,15\cdot127=19,05\left(g\right)\end{matrix}\right.\)
PTHH: Fe+2HCl→FeCl2+H2↑Fe+2HCl→FeCl2+H2↑
Ta có: nH2=3,3622,4=0,15(mol)nH2=3,3622,4=0,15(mol)
⇒{nHCl=0,3(mol)nFeCl2=nFe=0,15(mol)⇒{nHCl=0,3(mol)nFeCl2=nFe=0,15(mol) ⇒⎧⎪⎨⎪⎩mHCl=0,3⋅36,5=10,95(g)mFe=0,15⋅56=8,4(g)mFeCl2=0,15⋅127=19,05(g)⇒{mHCl=0,3⋅36,5=10,95(g)mFe=0,15⋅56=8,4(g)mFeCl2=0,15⋅127=19,05(g)
\(a) Fe + 2HCl \to FeCl_2 + H_2\\ b) n_{H_2} = n_{Fe} = \dfrac{8,4}{56} = 0,15(mol)\\ V_{H_2} = 0,15.22,4 = 3,36(lít)\\ n_{HCl} = 2n_{H_2} = 0,3(mol)\ m_{HCl} = 0,3.36,5 = 10,95(gam)\)
\(Fe+2HCl\rightarrow FeCl_2+H_2\)
\(n_{Fe}=0,1\left(mol\right)\)
a, \(m_{FeCl_2}=0,1.\left(56+35,5.2\right)=12,7\left(g\right)\)
b, \(V_{H_2}=0,1.22,4=2,24\left(l\right)\)
\(n_{Fe}=\dfrac{m}{M}=\dfrac{11,2}{56}=0,2\left(mol\right)\\ PTHH:Fe+2HCl->FeCl_2+H_2\)
tỉ lệ: 1 : 2 : 1 : 1
n(mol) 0,2--->0,4------->0,2----->0,2
\(m_{FeCl_2}=n\cdot M=0,2\cdot\left(56+35,5\cdot2\right)=25,4\left(g\right)\\ V_{H_2\left(dktc\right)}=n\cdot22,4=0,2\cdot22,4=4,48\left(l\right)\\ V_{H_2\left(dkc\right)}=n\cdot24,79=4,958\left(l\right)\)
a) \(Fe+2HCl\rightarrow FeCl_2+H_2\uparrow\)
b) \(n_{Fe}=\dfrac{m_{Fe}}{M_{Fe}}=\dfrac{11,2}{56}=0,2\left(mol\right)\)
Theo phương trình hóa học: \(n_{H_2}=n_{Fe}=o,2\left(mol\right)\)
\(V_{H_2\left(dktc\right)}=n_{H_2}\times22,4=0,2\times22,4=4,48\left(l\right)\)
\(V_{H_2\left(dkc\right)}=n_{H_2}\times24,79=0,2\times24,79=4,96\left(l\right)\)
c) Theo phương trình hóa học: \(n_{FeCl_2}=n_{H_2}=0,2\left(mol\right)\)
\(m_{FeCl_2}=n_{FeCl_2}\times M_{FeCl_2}=0,2.127=25,4\left(g\right)\)
\(n_{Fe}=\dfrac{11.2}{56}=0.2\left(mol\right)\)
\(Fe+2HCl\rightarrow FeCl_2+H_2\)
\(0.2......0.4...........0.2.........0.2\)
\(V_{H_2}=0.2\cdot22.4=4.48\left(l\right)\)
\(m_{HCl}=0.4\cdot36.5=14.6\left(g\right)\)
\(BTKL:\)
\(m_{HCl}=m_{FeCl_2}+m_{H_2}-m_{Fe}=0.2\cdot127+0.2\cdot2-11.2=14.6\left(g\right)\)
\(a) Fe + 2HCl \to FeCl_2 + H_2\\ b) n_{H_2} = n_{Fe} = \dfrac{11,2}{56} = 0,2(mol)\\ \Rightarrow V_{H_2} = 0,2.22,4 = 4,48(lít)\\ c)C_1 : n_{HCl} = 2n_{Fe} = 0,4(mol) \Rightarrow m_{HCl} = 0,4.36,5 = 14,6(gam)\\ C_2 : \text{Bảo toàn khối lượng : }\\ m_{Fe} + m_{HCl} = m_{FeCl_2} + m_{H_2}\\ \Rightarrow m_{HCl} = 0,2.127 + 0,2.2 - 11,2 = 14,6(gam) \)
\(n_{Fe}=\dfrac{m}{M}=\dfrac{28}{56}=0,5\left(mol\right)\\ PTHH:Fe+2HCl->FeCl_2+H_2\)
ti le 1 : 2 : 1 : 1
n(mol) 0,5-->1--------->0,5------>0,5
\(m_{FeCl_2}=n\cdot M=0,5\cdot\left(56+35,5\cdot2\right)=63,5\left(g\right)\\ V_{H_2\left(dktc\right)}=n\cdot22,4=0,5\cdot22,4=11,2\left(l\right)\)
a.b.
\(n_{Fe}=\dfrac{2,8}{56}=0,05mol\)
\(Fe+2HCl\rightarrow FeCl_2+H_2\)
0,05 0,1 0,05 ( mol )
\(V_{H_2}=0,05.22,4=1,12l\)
\(m_{HCl}=0,1.36,5=3,65g\)
c.
\(CuO+H_2\rightarrow\left(t^o\right)Cu+H_2O\)
0,05 0,05 ( mol )
\(m_{Cu}=0,05.64=3,2g\)
a/ PTHH: Fe + 2HCl ===> FeCl2 + H2
nFe = 16,8 / 56 = 0,3 (mol)
=> nH2 = nFe = 0,3 (mol)
=> VH2(đktc) = 0,3 x 22,4 = 6,72 lít
b/ nHCl = 2nFe = 0,6 mol
=> mHCl = 0,6 x 36,5 = 21,9(gam)
c/ nFeCl2 = nFe = 0,3 mol
=> mFeCl2 = 0,3 x 127 = 38,1 (gam)
c.ơn