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a) Gọi số mol Al, Zn là 2a, a (mol)
PTHH: 4Al + 3O2 --to--> 2Al2O3
2a-->1,5a---------->a
2Zn + O2 --to--> 2ZnO
a---->0,5a------->a
=> \(102a+81a=18,3\)
=> a = 0,1 (mol)
=> \(\left\{{}\begin{matrix}\%m_{Al}=\dfrac{0,2.27}{0,2.27+0,1.65}.100\%=45,378\%\\\%m_{Zn}=\dfrac{0,1.65}{0,2.27+0,1.65}.100\%=54,622\%\end{matrix}\right.\)
b) \(n_{O_2}=1,5a+0,5a=0,2\left(mol\right)\)
=> \(V_{O_2}=0,2.22,4=4,48\left(l\right)\)
\(Ta.có:\dfrac{n_{Mg}}{n_{Zn}}=\dfrac{3}{1}\Rightarrow\dfrac{\dfrac{m_{Mg}}{M_{Mg}}}{\dfrac{m_{Zn}}{M_{Zn}}}=\dfrac{m_{Mg}}{24}.\dfrac{65}{m_{Zn}}=\dfrac{3}{1}\Rightarrow\dfrac{m_{Mg}}{m_{Zn}}=\dfrac{3}{1}:\dfrac{65}{24}=\dfrac{72}{24}\)
\(\Rightarrow n_{Mg}=13,7:\left(72+24\right).3=0,3\left(mol\right)\\ \Rightarrow n_{Zn}=\dfrac{n_{Mg}}{3}=\dfrac{0,3}{3}=0,1\left(mol\right)\)
\(\Rightarrow m_{Mg}=n.M=0,3.24=7,2\left(g\right)\\ \Rightarrow m_{Zn}=n.M=0,12.65=6,5\left(g\right)\)
\(a,PTHH:2Mg+O_2\underrightarrow{t^o}2MgO\left(1\right)\\ PTHH:2Zn+O_2\underrightarrow{t^o}2ZnO\left(2\right)\)
\(Theo.PTHH\left(1\right):n_{O_2\left(1\right)}=\dfrac{1}{2}.n_{Mg}=\dfrac{1}{2}.0,3=0,15\left(mol\right)\\ Theo.PTHH\left(2\right):n_{O_2\left(2\right)}=\dfrac{1}{2}.n_{Zn}=\dfrac{1}{2}.0,1=0,05\left(mol\right)\\ n_{O_2\left(tổng\right)}=n_{O_2\left(1\right)}+n_{O_2\left(2\right)}=0,15+0,05=0,2\left(mol\right)\\ V_{O_2\left(tổng,đktc\right)}=n.22,4=0,2.22,4=4,48\left(l\right)\)
\(b,Theo.PTHH\left(1\right):n_{MgO}=n_{Mg}=0,3\left(mol\right)\\ m_{MgO}=n.M=0,3.40=12\left(g\right)\\ Theo.PTHH\left(2\right):n_{ZnO}=n_{Zn}=0,1\left(mol\right)\\ m_{ZnO}=n.M=0,1.81=8,1\left(g\right)\\ m=m_{hh}=m_{MgO}+m_{ZnO}=12+8,1=20,1\left(g\right)\)
PTHH: 2Cu + O2 ---to→ 2CuO
Mol: x 0,5x
PTHH: 2Mg + O2 ---to→ 2MgO
Mol: 0,5x 0,25x (do số mol của Cu gấp đôi Mg)
Ta có: \(64x+24.0,25x=15,2\Leftrightarrow x=\dfrac{38}{175}\left(mol\right)\)
\(\Rightarrow n_{O_2}=0,5.\dfrac{38}{175}+0,25.\dfrac{38}{175}=\dfrac{57}{350}\left(mol\right)\)
\(\Rightarrow V_{O_2}=\dfrac{57}{350}.22,4=3,648\left(l\right)\)
\(\Rightarrow V_{kk}=3,648.5=18,24\left(l\right)\)
$n_{CO_2} = \dfrac{8,8}{44} = 0,2(mol)$
\(2CO+O_2\xrightarrow[]{t^o}2CO_2\)
0,2 0,1 0,2 (mol)
$n_{O_2} = \dfrac{9,6}{32} = 0,3(mol)$
\(2H_2+O_2\xrightarrow[]{t^o}2H_2O\)
0,4 0,2 0,2 (mol)
\(\%m_{CO}=\dfrac{0,2.44}{0,2.44+0,4.2}.100\%=91,67\%\\ \%m_{H_2}=100\%-91,67\%=8,33\%\)
\(\%n_{CO}=\dfrac{0,2}{0,2+0,4}.100\%=33,33\%\\ \%n_{H_2}=100\%-33,33\%=66,67\%\)
\(2Zn+O_2\xrightarrow[]{t^o}2ZnO\)
0,02--0,01
\(4Al+3O_2\xrightarrow[]{t^o}2Al_2O_3\)
0,03--0,0225
\(\Rightarrow V_{O_2}=0,0325\cdot22,4=0,728\left(l\right)\)
\(2Zn+O_2\xrightarrow[t^0]{}2ZnO\)
0,02 0,01
\(4Al+3O_2\xrightarrow[]{t^0}2Al_2O_3\)
0,03 0,0225
\(2Ca+O_2\xrightarrow[]{t^0}2CaO\)
0,01 0,005
\(V_{O_2}=\left(0,01+0,0225+0,005\right).22,4=0,84l\)