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a) PTHH: \(Fe+2HCl\rightarrow FeCl_2+H_2\uparrow\)
b+c) Ta có: \(n_{Fe}=\dfrac{8,4}{56}=0,15\left(mol\right)\)
\(\Rightarrow\left\{{}\begin{matrix}n_{H_2}=0,15\left(mol\right)\\n_{HCl}=0,3\left(mol\right)\end{matrix}\right.\) \(\Rightarrow\left\{{}\begin{matrix}V_{H_2}=0,15\cdot22,4=3,36\left(l\right)\\m_{ddHCl}=\dfrac{0,3\cdot36,5}{10,95\%}=100\left(g\right)\end{matrix}\right.\)
d) PTHH: \(H_2+CuO\xrightarrow[]{t^o}Cu+H_2O\)
Ta có: \(\left\{{}\begin{matrix}n_{H_2}=0,15\left(mol\right)\\n_{CuO}=\dfrac{24}{80}=0,3\left(mol\right)\end{matrix}\right.\) \(\Rightarrow\) CuO còn dư
\(\Rightarrow n_{CuO\left(dư\right)}=0,15\left(mol\right)\) \(\Rightarrow m_{CuO\left(dư\right)}=0,15\cdot80=12\left(g\right)\)
Ta có: \(n_{H_2}=\dfrac{1,12}{22,4}=0,05\left(mol\right)\)
a, PT: \(Fe+2HCl\rightarrow FeCl_2+H_2\)
_____0,05__0,1____________0,05 (mol)
b, mFe = 0,05.56 = 2,8 (g)
c, mHCl = 0,1.36,5 = 3,65 (g)
\(\Rightarrow m_{ddHCl}=\dfrac{3,65}{10\%}=36,5\left(g\right)\)
Bạn tham khảo nhé!
\(n_{H_2}=\dfrac{1.12}{22.4}=0.05\left(mol\right)\)
\(Fe+2HCl\rightarrow FeCl_2+H_2\)
\(0.05......0.1...................0.05\)
\(m_{Fe}=0.05\cdot56=2.8\left(g\right)\)
\(m_{dd_{HCl}}=\dfrac{0.1\cdot36.5\cdot100}{10}=36.5\left(g\right)\)
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)
\(n_{H_2}=\dfrac{13,44}{22,4}=0,6mol\)
\(Fe+2HCl\rightarrow FeCl_2+H_2\)
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
=> \(\left\{{}\begin{matrix}m_{Fe}=0,3.56=16,8\left(g\right)\\m_{FeCl_2}=127.0,3=38,1\left(g\right)\\C_{M\left(HCl\right)}=\dfrac{0,6}{0,3}=2M\end{matrix}\right.\)
a.Ta có: nHCl=1.\(\frac{200}{1000}\)=0,2(mol)
Ta có phương trình 2Al + 6HCl -----> 2AlCl3 + 3H2 (1)
Theo phương trình: 2 mol 6 mol 3 mol
Theo đề: x mol 0,2 mol 0,1 mol
=> V\(H_2\)=0,1.22,4=2,24(l)
b. Từ pt (1), ta có:
mAl=x.27=\(\frac{0,2.2}{6}\).27=1,8(g)
c.Từ pt (1), ta có: mHCl=0,2. (1+35,5)=7,3(g)
mdd=\(\frac{200}{1000}.22,4.18=80,64\left(g\right)\)
=>C%=\(\frac{7,3}{80,64}.100\%=9,1\%\)
Ungr hộ nha!
Fe + 2HCl \(\rightarrow\)FeCl2 + H2
nFe=\(\dfrac{8,4}{56}=0,15\left(mol\right)\)
Theo PTHH ta có:
nFe=nH2=0,15(mol)
VH2=0,15.22,4=3,36(lít)
b;Theo PTHH ta có:
2nFe=nHCl=0,3(mol)
mHCl=0,3.36,5=10,95(g)
mdd HCl=\(10,95:\dfrac{10,95}{100}=100\left(g\right)\)
c;
Theo PTHH ta có:
nFe=nFeCl2=0,15(mol)
mFeCl2=0,15.127=19,05(g)
C% dd FeCl2=\(\dfrac{19,05}{8,4+100-0,15.2}.100\%=17,6\%\)
nFe=m/M=8,4/56=0,15(mol)
PT: Fe + 2HCl -> FeCl2 +H2
vậy:0,15-->0,3----->0,15-->0,15(mol)
=> VH2=n.22,4=0,15.22,4=3,36(lít)
b)mHCl=n.M=0,3.36,5=10,95(g)
\(\Rightarrow m_{ddHCl}=\dfrac{m_{HCl}.100\%}{C\%}=\dfrac{10,95.100}{10,95}=100\left(g\right)\)
c) md d sau phan ứng=mFe +md d HCl-mH2=8,4+100-(0,15.2)=108,1(g)
mFeCl2=n.M=0,15.127=19,05(g)
\(\Rightarrow C\%_{ddsauphanung}=\dfrac{m_{FeCl_2}.100\%}{m_{ddsauphanung}}=\dfrac{19,05.100}{108,1}\approx17,622\left(\%\right)\)