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Fe+2HCl->FeCl2+H2
0,125--0,25---0,125-0,125
m HCl=9,125 g=>n HCl=\(\dfrac{9,125}{26,5}\)=0,25 mol
=>m Fe=0,125.56=7g
=>VH2=0,125.22,4=2,8l
=>C%FeCl2=\(\dfrac{0,125.127}{7+182,5-0,25}\).100=8,388%
\(a.2Al+6HCl\rightarrow2AlCl_3+3H_2\\ b.n_{Al}=0,2\left(mol\right)\\ n_{HCl}=3n_{Al}=0,6\left(mol\right)\\ C\%_{HCl}=\dfrac{0,6.36,5}{150}.100=14,6\%\\ c.n_{H_2}=\dfrac{3}{2}n_{Al}=0,3\left(mol\right)\\ Bảotòannguyêntố\left(H\right)\Rightarrow n_{H_2O}=n_{H_2}=0,3\left(mol\right)\\ Bảotoànkhốilượng:m_{H_2}+m_{oxit}=m_{Fe}+m_{H_2O}\\ \Rightarrow m_{Fe}=0,3.2+17,4-0,3.18=12,6\left(g\right)\\ \Rightarrow n_{Fe}=0,225\left(mol\right)\\ Tabiết:Oxitsắtlàbaogồm:Fe,O\\ \Rightarrow m_O=17,4-12,6=4,8\left(g\right)\\ \Rightarrow n_O=0,3\left(mol\right)\\ GọiCToxitsắtlà:Fe_xO_y\left(x,y>0,x,ynguyên\right)\\ Tacó:x:y=0,225:0,3=3:4\\ VậyCToxitsắtcầntìmlàFe_3O_4\)
\(a) Fe + 2HCl \to FeCl_2\\ b) n_{HCl} = \dfrac{182,5.5\%}{36,5} = 0,25(mol)\\ n_{FeCl_2} = n_{H_2} = n_{Fe} = \dfrac{1}{2}n_{HCl} = 0,125(mol)\\ \Rightarrow m_{Fe} = 0,125.56 = 7(gam) ; V = 0,125.22,4 = 2,8(lít)\\ c) m_{dd\ sau\ phản\ ứng} = m_{Fe} + m_{dd\ HCl} - m_{H_2} = 7 + 182,5 - 0,125.2 = 189,25(gam)\\ C\%_{FeCl_2} = \dfrac{0,125.127}{189,25}.100\% = 8,39\%\)
a, \(Zn+2HCl\rightarrow ZnCl_2+H_2\)
b, \(n_{Zn}=\dfrac{13}{65}=0,2\left(mol\right)\)
Theo PT: \(n_{H_2}=n_{Zn}=0,2\left(mol\right)\Rightarrow V_{H_2}=0,2.22,4=4,48\left(l\right)\)
c, \(n_{ZnCl_2}=n_{Zn}=0,2\left(mol\right)\Rightarrow m_{ZnCl_2}=0,2.136=27,2\left(g\right)\)
d, \(n_{HCl}=2n_{Zn}=0,4\left(mol\right)\Rightarrow m_{HCl}=0,4.36,5=14,6\left(g\right)\)
\(\Rightarrow m_{ddHCl}=\dfrac{14,6}{7,3\%}=200\left(g\right)\)
⇒ m dd sau pư = 13 + 200 - 0,2.2 = 212,6 (g)
\(\Rightarrow C\%_{ZnCl_2}=\dfrac{27,2}{212,6}.100\%\approx12,79\%\)
\(a.2Al+6HCl->2AlCl_3+3H_2\\ Mg+2HCl->MgCl_2+H_2\\ b.n_{Al}=a,n_{Mg}=b\\ 27a+24b=7,5\left(I\right)\\ 1,5a+b=\dfrac{7,84}{22,4}=0,35\left(II\right)\\ a=0,1;b=0,2\\ \%m_{Al}=\dfrac{27\cdot0,1}{7,5}\cdot100\%=36\%\\ \%m_{Mg}=64\%\\ c.m_{HCl}=36,5\left(0,1\cdot3+0,2\cdot2\right)=18,25g\\ d.m_{ddsau}=7,5+\dfrac{18,25}{14,6:100}-0,35\cdot2=131,8g\\ C\%\left(AlCl_3\right)=\dfrac{133,5\cdot0,1}{131,8}\cdot100\%=10,1\%\\ C\%\left(MgCl_2\right)=\dfrac{95\cdot0,2}{131,8}\cdot100\%=14,4\%\)
`a)PTHH:`
`Zn + 2HCl -> ZnCl_2 + H_2`
`0,2` `0,4` `0,2` `0,2` `(mol)`
`n_[Zn]=13/65=0,2(mol)`
`b)V_[H_2]=0,2.22,4=4,48(l)`
`c)m_[dd HCl]=[0,4.36,5]/5 . 100=292(g)`
`=>C%_[ZnCl_2]=[0,2.136]/[13+292-0,2.2].100~~8,93%`
`a)PTHH`
`Fe + 2HCl -> FeCl_2 + H_2`
`0,125` `0,25` `0,125` `0,125` `(mol)`
`n_[HCl]=[5/100 .182,5]/[36,5]=0,25(mol)`
`b)m_[Fe]=0,125.56=7(g)`
`V_[H_2]=0,125.22,4=2,8(l)`
`c)m_[HCl]=0,25.36,5=9,125(g)`
`m_[FeCl_2]=0,125.127=15,875(g)`
`d)C%_[FeCl_2]=[15,875]/[7+182,5-0,125.2] .100~~8,39%`
a) $2Al + 6HCl \to 2AlCl_3 + 3H_2$
b) n Al = 8,1/27 = 0,3(mol)
Theo PTHH :
n H2 = 3/2 n Al = 0,45(mol)
V H2 = 0,45.22,4 = 10,08(lít)
c) n AlCl3 = n Al = 0,3(mol)
m AlCl3 = 0,3.133,5 = 40,05(gam)
d) n HCl = 3n Al = 0,9(mol)
m dd HCl = 0,9.36,5/7,3% = 450(gam)
Sau phản ứng :
m dd = 8,1 + 450 -0,45.2 = 457,2(gam)
C% AlCl3 = 40,05/457,2 .100% = 8,76%
a.b.\(n_{Fe_2O_3}=\dfrac{16}{160}=0,1mol\)
\(Fe_2O_3+3H_2\rightarrow\left(t^o\right)2Fe+3H_2O\)
0,1 0,3 0,2 ( mol )
\(V_{H_2}=0,3.22,4=6,72l\)
c.\(n_{HCl}=\dfrac{125.14,6\%}{36,5}=0,5mol\)
\(Fe+2HCl\rightarrow FeCl_2+H_2\)
0,2 < 0,5 ( mol )
0,2 0,2 0,2 ( mol )
\(m_{FeCl_2}=0,2.127=25,4g\)
\(m_{ddspứ}=\left(0,2.56\right)+125-0,2.2=135,8g\)
\(C\%_{FeCl_2}=\dfrac{25,4}{135,8}.100=18,7\%\)
\(n_{Fe_2O_3}=\dfrac{16}{160}=0,1\left(mol\:\right)\\ Fe_2O_3+3H_2\underrightarrow{t^o}2Fe+3H_2O\)
0,1 0,3 0,2
=> \(m_{H_2}=0,3.22,4=6,72\left(l\right)\)
\(m_{HCl}=125.14,6\%=18,25\left(g\right)\)
\(m_{Fe}=0,2.56=11,2\left(g\right)\)
Fe + 2HCl →FeCl2 +H2
\(C\%=\dfrac{11,2}{18,25}.100\%=61,3\%\)