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a.b.c.\(n_{Al}=\dfrac{2,7}{27}=0,1mol\)
\(2Al+6HCl\rightarrow2AlCl_3+3H_2\)
0,1 0,1 0,15 ( mol )
\(V_{H_2}=0,15.22,4=3,36l\)
\(m_{AlCl_3}=0,1.133,5=13,35g\)
d.\(Fe_2O_3+3H_2\rightarrow\left(t^o\right)2Fe+3H_2O\)
0,15 0,1 ( mol )
\(m_{Fe}=0,1.56=5,6g\)
nFe = 16,8/56 = 0,3 (mol)
PTHH: Fe + 2HCl -> FeCl2 + H2
Mol: 0,3 ---> 0,6 ---> 0,3 ---> 0,3
VH2 = 0,3 . 24,79 = 7,437 (l)
mHCl = 0,6 . 36,5 = 21,9 (g)
PTHH: CuO + H2 -> (t°) Cu + H2O
Mol: 0,3 <--- 0,3 ---> 0,3
mCu = 0,3 . 64 = 19,2 (g)
mFe = 16,8: 56 =0,3(mol)
pthh : Fe + 2HCl --> FeCl2 + H2 (1)
0,3 ->0,6-----------------> 0,3 (mol)
=> VH2 (đkc) = 0,3 . 24,79 ( l)
=> mHCl = 0,6 . 35,5 = 21,9 (g)
pthh : CuO + H2 -t--> Cu+ H2O
0,3<-----0,3 (mol)
=>mCu = 0,3 . 64 = 19,2 (g)
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 )
\(m_{Cu}=0,05.64=3,2g\)
\(n_{Mg}=\dfrac{4,8}{24}=0,2\left(mol\right)\\ pthh:Mg+2HCl\rightarrow MgCl_2+H_2\)
0,2 0,4 0,2
\(\Rightarrow m_{HCl}=0,4.36,5=14,6\left(g\right)\\ V_{H_2}=0,2.22,4=4,48\left(l\right)\\ pthh:FeO+H_2\underrightarrow{t^o}Fe+H_2O\)
0,2 0,2 0,2
\(m_{Fe}=0,2.56=11,2\left(g\right)\)
\(n_{Al}=\dfrac{16,2}{27}=0,6\left(mol\right)\)
2Al + 3H2SO4 ---> Al2(SO4)3 + 3H2
0,6 0,9 0,3 0,9
\(\rightarrow V_{H_2}=0,9.22,4=20,16\left(l\right)\)
\(n_{Cu}=\dfrac{57}{64}=0,890625\left(mol\right)\)
PTHH: CuO + H2 --to--> Cu + H2O
0,890625 0,890625
\(H=\dfrac{0,890625}{0,9}=99\%\)
\(n_{Zn}=\dfrac{m}{M}=\dfrac{3,25}{65}=0,05\left(mol\right)\)
\(PTHH:Zn+2HCl\rightarrow ZnCl_2+H_2\)
1 2 1 1
0,05 0,1 0,05 0,05
a) \(V_{H_2}=n.24,79=0,05.24,79=1,2395\left(l\right)\)
\(m_{ZnCl_2}=n.M=0,05.\left(65+35,5.2\right)=6,8\left(g\right)\)
b) \(PTHH:CuO+H_2\underrightarrow{t^o}Cu+H_2O\)
Ta cos tỉ lệ: \(\dfrac{0,1}{1}>\dfrac{0,05}{1}\Rightarrow\) CuO dư.
Theo ptr, ta có: \(n_{Cu}=n_{H_2}=0,05mol\\ \Rightarrow m_{Cu}=n.M=0,05.64=3,2\left(g\right).\)
a, PT: \(Zn+2HCl\rightarrow ZnCl_2+H_2\)
Ta có: \(n_{Zn}=\dfrac{3,25}{65}=0,05\left(mol\right)\)
THeo PT: \(n_{ZnCl_2}=n_{H_2}=n_{Zn}=0,05\left(mol\right)\)
\(\Rightarrow V_{H_2}=0,05.24,79=1,2395\left(l\right)\)
\(m_{ZnCl_2}=0,05.136=6,8\left(g\right)\)
b, Ta có: \(n_{CuO}=\dfrac{8}{80}=0,1\left(mol\right)\)
PT: \(CuO+H_2\underrightarrow{t^o}Cu+H_2O\)
Xét tỉ lệ: \(\dfrac{0,1}{1}>\dfrac{0,05}{1}\), ta được CuO dư.
Theo PT: \(n_{Cu}=n_{H_2}=0,05\left(mol\right)\Rightarrow m_{Cu}=0,05.64=3,2\left(g\right)\)
\(n_{Fe}=\dfrac{16.8}{56}=0.3\left(mol\right)\)
\(Fe+2HCl\rightarrow FeCl_2+H_2\)
\(0.3....................0.3.........0.3\)
\(m_{FeCl_2}=0.3\cdot127=38.1\left(g\right)\)
\(V_{H_2}=0.6\cdot22.4=6.72\left(l\right)\)
\(CuO+H_2\underrightarrow{t^0}Cu+H_2O\)
\(.......0.3...0.3\)
\(m_{Cu}=0.3\cdot64=19.2\left(g\right)\)
PT: \(Fe+2HCl\rightarrow FeCl_2+H_2\)
a, Ta có: \(n_{Fe}=\dfrac{16,8}{56}=0,3\left(mol\right)\)
Theo PT: \(n_{FeCl_2}=n_{Fe}=0,3\left(mol\right)\)
\(\Rightarrow m_{FeCl_2}=0,3.127=38,1\left(g\right)\)
b, Theo PT: \(n_{H_2}=n_{Fe}=0,3\left(mol\right)\)
\(\Rightarrow V_{H_2}=0,3.22,4=6,72\left(l\right)\)
c, PT: \(CuO+H_2\underrightarrow{t^o}Cu+H_2O\)
Theo PT: \(n_{Cu}=n_{H_2}=0,3\left(mol\right)\)
\(\Rightarrow m_{Cu}=0,3.64=19,2\left(g\right)\)
Bạn tham khảo nhé!