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a, Gọi \(\left\{{}\begin{matrix}n_{Fe}=a\left(mol\right)\\n_{Al}=b\left(mol\right)\end{matrix}\right.\)
\(n_{H_2}=\dfrac{11,2}{22,4}=0,5\left(mol\right)\)
PTHH:
Fe + 2HCl ---> FeCl2 + H2
a--->2a------------------>a
2Al + 6HCl ---> 2AlCl3 + 3H2
b---->3b-------------------->1,5b
=> \(\left\{{}\begin{matrix}56a+27b=16,6\\a+1,5b=0,5\end{matrix}\right.\Leftrightarrow a=b=0,2\left(mol\right)\)
=> \(\left\{{}\begin{matrix}m_{Fe}=0,2.56=11,2\left(g\right)\\m_{Al}=0,2.27=5,4\left(g\right)\end{matrix}\right.\)
b) \(C\%_{HCl}=\dfrac{\left(0,2.2+0,2.3\right).36,5}{300}.100\%=12,167\%\)
\(n_{H_2}=\dfrac{11,2}{22,4}=0,5\left(mol\right)\)
gọi nFe : a , nAl: b (a,b>0) => 56a + 27b = 16,6 (g)
\(pthh:Fe+2HCl\rightarrow FeCl_2+H_2\uparrow\)
a a
\(2Al+6HCl\rightarrow2AlCl_3+3H_2\uparrow\)
b \(\dfrac{3b}{2}\)
=> \(a+\dfrac{3b}{2}=0,5\)
ta có hệ pt
\(\left\{{}\begin{matrix}56a+27b=16,6\\a+\dfrac{3b}{2}=0,5\end{matrix}\right.\)
=> a= 0,2 , b = 0,2
\(\left\{{}\begin{matrix}m_{Fe}=0,2.56=11,2\left(g\right)\\m_{Al}=16,6-11,2=5,4\left(g\right)\end{matrix}\right.\)
\(pthh:Fe+2HCl\rightarrow FeCl_2+H_2\)
0,2 0,4
\(2Al+6HCl\rightarrow2AlCl_3+3H_2\)
0,2 0,6
=> \(m_{HCl}=\left(0,4+0,6\right).36,5=36,5\left(g\right)\)
=> \(C\%=\dfrac{36,5}{200}.100\%=18,25\%\)
\(n_{Fe}=\dfrac{11.2}{56}=0.2\left(mol\right)\)
\(Fe+2HCl\rightarrow FeCl_2+H_2\)
\(0.2.......0.4...................0.2\)
\(V_{H_2}=0.2\cdot22.4=4.48\left(l\right)\)
\(C_{M_{HCl}}=\dfrac{0.4}{0.4}=1\left(M\right)\)
\(n_{CuO}=\dfrac{8}{80}=0.1\left(mol\right)\)
\(CuO+H_2\underrightarrow{^{t^0}}Cu+H_2O\)
\(1............1\)
\(0.1.........0.2\)
\(LTL:\dfrac{0.1}{1}< \dfrac{0.2}{1}\Rightarrow H_2dư\)
\(n_{Cu}=n_{CuO}=0.1\left(mol\right)\)
\(m_{Cu}=0.1\cdot64=6.4\left(g\right)\)
Chúc em học tốt và có những trải nghiệm tuyệt vời tại hoc24.vn nhé !
a) nFe=0,2(mol)
PTHH: Fe + 2HCl -> FeCl2 + H2
0,2_________0,4____0,2___0,2(mol)
V(H2,dktc)=0,2.22,4=4,48(l)
b) VddHCl=0,4/0,4=1(l)
c) nCuO=0,1(mol)
PTHH: CuO + H2 -to-> Cu + H2O
Ta có: 0,2/1 > 0,1/1
=> CuO hết, H2 dư, tính theo nCuO
-> nCu=nCuO=0,1(mol)
=>mCu=0,1.64=6,4(g)
a) Fe + 2HCl --> FeCl2 + H2
b) \(n_{Fe}=\dfrac{5,6}{56}=0,1\left(mol\right)\)
PTHH: Fe + 2HCl --> FeCl2 + H2
_____0,1--------------->0,1---->0,1
=> mFeCl2 = 0,1.127 = 12,7(g)
c) VH2 = 0,1.22,4 = 2,24(l)
\(n_{Fe}=\dfrac{5,6}{56}=0,1(mol)\\ a,Fe+2HCl\to FeCl_2+H_2\\ \Rightarrow n_{FeCl_2}=n_{H_2}=0,1(mol)\\ a,m_{FeCl_2}=0,1.127=12,7(g)\\ b,V_{H_2}=0,1.22,4=2,24(l)\)
nFe = \(\dfrac{22,4}{56}=0,4\left(mol\right)\)
Pt: Fe + 2HCl --> FeCl2 + H2
....0,4........0,8.........0,4........0,4
Vdd HCl đã dùng = \(\dfrac{0,8}{0,5}=1,6M\)
VH2 thu được = 0,4 . 22,4 = 8,96 (lít)
mFeCl2 thu được sau pứ = 0,4 . 127 = 50,8 (g)
\(n_{H_2}=\dfrac{13,44}{22,4}=0,6mol\)
\(Fe+2HCl\rightarrow FeCl_2+H_2\)
0,6 1,2 0,6 0,6 ( mol )
\(m_{Fe}=0,6.56=33,6g\)
\(m_{FeCl_2}=0,6.127=76,2g\)
\(C_{M_{HCl}}=\dfrac{1,2}{0,6}=2M\)
`Fe + 2HCl -> FeCl_2 + H_2↑`
`0,3` `0,6` `0,3` `0,3` `(mol)`
`n_[H_2] = [ 6,72 ] / [ 22,4 ] = 0,3 (mol)`
`-> m_[Fe] = 0,3 . 56 = 16,8 (g)`
`-> m_[FeCl_2] = 0,3 . 127 = 38,1 (g)`
`b) C_[M_[HCl]] = [ 0,6 ] / [ 0,3 ] = 2 (M)`
\(n_{H_2}=\dfrac{6,72}{22,4}=0,3\left(mol\right)\)
PTHH: Fe + 2HCl ---> FeCl2 + H2
0,3<---0,6<------0,3<-----0,3
=> \(\left\{{}\begin{matrix}m_{Fe}=0,3.56=16,8\left(g\right)\\m_{FeCl_2}=127.0,3=38,1\left(g\right)\\C_{M\left(HCl\right)}=\dfrac{0,6}{0,3}=2M\end{matrix}\right.\)
1
a)C%=\(\dfrac{20}{620}100=3,225\%\)
b) CM=\(\dfrac{1,5}{0,75}=2M\)
2
3H2+Fe2O3-to>2Fe+3H2O
0,1----------0,2
n Fe=0,2 mol
=>m Fe2O3=0,1.160=16g