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nFe2O3 = 32/160 = 0,2 (mol)
PTHH: Fe2O3 + 3H2 -> (t°) 2Fe + 3H2O
Mol: 0,2 ---> 0,6 ---> 0,4
mFe = 0,4 . 56 = 22,4 (g)
VH2 = 0,6 . 24,79 = 14,874 (l)
\(n_{Mg}=\dfrac{7,2}{24}=0,3\left(mol\right)\)
PTHH:
Mg + 2HCl ---> MgCl2 + H2
0,3-->0,6----------------->0,3
=> \(\left\{{}\begin{matrix}V_{H_2}=24,79.0,3=7,437\left(l\right)\\m_{HCl}=0,6.36,5=21,9\left(g\right)\end{matrix}\right.\)
\(n_{CuO}=\dfrac{12}{80}=0,15\left(mol\right)\)
PTHH: CuO + H2 --to--> Cu + H2O
LTL: 0,15 < 0,3 => H2 dư, vậy H2 khử hết CuO
a, \(n_{Mg}=\dfrac{7,2}{24}=0,3\left(mol\right)\)
Mg + 2HCl -----> MgCl2 + H2
0,3 0,6 0,3
\(V_{H_2}=0,3.22,4=6,72\left(l\right)\)
b, \(m_{HCl}=0,6.36,5=21,9\left(g\right)\)
c, \(n_{CuO}=\dfrac{12}{80}=0,15\left(mol\right)\)
CuO + H2 -----> Cu + H2O
Ta có: \(\dfrac{0,15}{1}< \dfrac{0,3}{1}\) ⇒ CuO hết, H2 dư
a, PT: \(CuO+H_2\underrightarrow{t^o}Cu+H_2O\)
Ta có: \(n_{CuO}=\dfrac{12}{80}=0,15\left(mol\right)\)
Theo PT: \(n_{H_2}=n_{Cu}=n_{H_2O}=n_{CuO}=0,15\left(mol\right)\)
b, \(m_{Cu}=0,15.64=9,6\left(g\right)\)
\(m_{H_2O}=0,15.18=2,7\left(g\right)\)
c, \(V_{H_2}=0,15.24,79=3,7185\left(l\right)\)
\(n_{O_2}=\dfrac{2,479}{24,79}=0,1(mol)\\ 2Cu+O_2\xrightarrow{t^o}2CuO\\ \Rightarrow n_{CuO}=0,2(mol)\\ \Rightarrow m_{CuO}=0,2.80=16(g)\)
a)
\(n_{H_2}=\dfrac{7,437}{24,79}=0,3\left(mol\right)\)
PTHH: 2Al + 6HCl --> 2AlCl3 + 3H2
0,2<---0,6<-----0,2<---0,3
=> mAl = 0,2.27 = 5,4 (g)
mHCl = 0,6.36,5 = 21,9 (g)
b) mAlCl3 = 0,2.133,5 = 26,7 (g)
c)
PTHH: Fe2O3 + 3H2 --to--> 2Fe + 3H2O
0,1<---0,3---------->0,2
=> mFe2O3 = 0,1.160 = 16 (g)
d) mFe = 0,2.56 = 11,2 (g)
a.b.\(n_{H_2}=\dfrac{V_{H_2}}{24,79}=\dfrac{7,437}{24,79}=0,3mol\)
\(2Al+6HCl\rightarrow2AlCl_3+3H_2\)
0,2 0,6 0,2 0,3 ( mol )
\(m_{Al}=n_{Al}.M_{Al}=0,2.27=5,4g\)
\(m_{HCl}=n_{HCl}.M_{HCl}=0,6.36,5=21,9g\)
\(m_{AlCl_3}=n_{AlCl_3}.M_{AlCl_3}=0,2.133,5=26,7g\)
c.d.\(Fe_2O_3+3H_2\rightarrow\left(t^o\right)2Fe+3H_2O\)
0,1 0,3 0,2 ( mol )
\(m_{Fe_2O_3}=n_{Fe_2O_3}.M_{Fe_2O_3}=0,1.160=16g\)
\(m_{Fe}=n_{Fe}.M_{Fe}=0,2.56=11,2g\)
a. \(n_{Cu}=\dfrac{28.8}{64}=0,45\left(mol\right)\)
PTHH : CuO + H2 -> Cu + H2O
0,45 0,45 0,45 0,45
\(V_{H_2}=0,45.22,4=10,08\left(l\right)\)
b. \(m_{Cu}=0,45.64=28,8\left(g\right)\)
ncu = 28,8/64 = 0,45 mol
CuO + H2 -> Cu + H2O
1 : 1 : 1 : 1
0,45mol
a) nH2 = (0,45.1) : 1 = 0,45 mol
VH2 = 0,45 . 22,4 = 10,08 ( l )
b) mCu = 0,45 . 64 = 28,8 ( g)