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a.
\(n_{Mg}=\dfrac{12}{24}=0,5mol\)
\(Mg+2HCl\rightarrow MgCl_2+H_2\)
0,5 0,5 ( mol )
\(V_{H_2}=0,5.22,4=11,2l\)
b.\(CuO+H_2\rightarrow\left(t^o\right)Cu+H_2O\)
0,5 0,5 ( mol )
\(m_{CuO}=0,5.80=40g\)
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
\(\Rightarrow n_{CuO\left(dư\right)}=0,15\left(mol\right)\) \(\Rightarrow m_{CuO\left(dư\right)}=0,15\cdot80=12\left(g\right)\)
nNa=11,5/23=0,5(mol)
nH2O=189/18=10,5(mol)
2Na+2H2O--->2NaOH+H2
2_____2
0,5___10,5
Ta có: 0,5/2<10,5/2
=>H2O dư
Theo pt: nH2=1/2nNa=1/2.0,5=0,25(mol)
=>VH2=0,25.22,4=5,6(l)
Theo pt: nNaOH=nNa=0,5(mol)
=>mNaOH=0,5.40=20(g)
mdd=11,5+189-0,25.2=200(g)
=>C%=20/200.100%=10%
nFeO=14,4/72=0,2(mol)
FeO+H2--->Fe+H2O
1____1
0,2___0,25
Ta có: 0,2/1<0,25/1
=>H2 dư
Theo pt: nFe=nFeO=0,2(mol)
=>mFe=0,2.56=11,2(g)
===>mFe thu đc= 11,2.75%=8,4(g)
\(2H2 + O2 -t^o-> 2H2O\)
\(n_H2 = \) \(\dfrac {11,2}{22,4} \) \(=\) \(0,5 (mol)\)
\(=>\) \(n_O2 = \dfrac{1} {2} . n_H2 = 0,25 ( mol)\)
\(=> V_O2 (đktc) = 0,25 . 22,4 = 5,6 (l)\)
\(=> V_K2= 5.V_O2\) = \(5.5,6 = 28 (l)\)
\(b) \)
\(Zn +2HCl ---> ZnCl2 + H2\)
\(nZn = nH2 = 0,5 (mol)\)
Khối lượng Kẽm cần dùng là :
\(=> mZn = 0,5.65 = 32,5 (g)\)
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!
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)
\(n_{Fe}=\dfrac{5,6}{56}=0,1(mol)\\ a,Fe+2HCl\to FeCl_2+H_2\\ \Rightarrow n_{FeCl_2}=n_{H_2}=0,1(mol)\\ a,m_{FeCl_2}=0,1.127=12,7(g)\\ b,V_{H_2}=0,1.22,4=2,24(l)\)
\(n_{H_2}=\dfrac{2,24}{22,4}=0,1\left(mol\right)\)
\(n_{Cu}=\dfrac{40}{80}=0,5\left(mol\right)\)
PTHH: \(CuO+H_2\xrightarrow[]{t^o}Cu+H_2O\left(1\right)\)
Xét tỉ lệ: \(\dfrac{0,5}{1}>\dfrac{0,1}{1}\) => CuO dư, tính theo H2
Theo PT \(\left(1\right):n_{Cu}=n_{H_2}=0,1\left(mol\right)\)
\(\rightarrow m_{Cu}=0,1.64=6,4\left(g\right)\)