Cho 2,7g Al tác dụng \(O_2\). tÍNH \(V_{O_2}=?\left(đktc\right)\); \(m_{Al_2O_3}=?\)
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![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(n_{Fe}=\dfrac{5.6}{56}=0.1\left(mol\right)\)
\(2Fe+\dfrac{3}{2}O_2\underrightarrow{t^0}Fe_2O_3\)
\(0.1.......0.075.....0.05\)
\(V_{O_2}=0.075\cdot22.4=1.68\left(l\right)\)
\(m_{Fe_2O_3}=0.05\cdot160=8\left(g\right)\)
PTHH: \(4Fe+3O_2\underrightarrow{t^o}2Fe_2O_3\)
Ta có: \(n_{Fe}=\dfrac{5,6}{56}=0,1\left(mol\right)\)
\(\Rightarrow\left\{{}\begin{matrix}n_{O_2}=0,075\left(mol\right)\\n_{Fe_2O_3}=0,05\left(mol\right)\end{matrix}\right.\) \(\Rightarrow\left\{{}\begin{matrix}V_{O_2}=0,075\cdot22,4=1,68\left(l\right)\\m_{Fe_2O_3}=0,05\cdot160=8\left(g\right)\end{matrix}\right.\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(n_{H_2O}=\dfrac{1.8}{18}=0.1\left(mol\right)\)
\(C_2H_2+\dfrac{5}{2}O_2\underrightarrow{t^0}2CO_2+H_2O\)
\(0.1.........0.25......0.2..........0.1\)
\(V_{C_2H_2}=2.24\left(l\right)\)
\(V_{O_2}=0.25\cdot22.4=5.6\left(l\right)\)
\(V_{CO_2}=0.2\cdot22.4=4.48\left(l\right)\)
![](https://rs.olm.vn/images/avt/0.png?1311)
$a\big)$
Bảo toàn KL:
$m_{O_2}=m_{CR}-m_{Fe}=11,84-11,2=0,64(g)$
$\to n_{O_2}=\frac{0,64}{32}=0,02(mol)$
$\to V_{O_2}=0,02.22,4=0,448(l)$
$b\big)$
$V_{kk}=5V_{O_2}=5.0,448=2,24(l)$
![](https://rs.olm.vn/images/avt/0.png?1311)
Ta có :
\(n_{Al} = \dfrac{2,7}{27} = 0,1(mol)\\ n_{O_2} = \dfrac{2,24}{22,4} = 0,1(mol)\\ 4Al + 3O_2 \xrightarrow{t^o} 2Al_2O_3\)
Ta thấy : \(\dfrac{n_{Al}}{4} = 0,025 < \dfrac{n_{O_2}}{3} =0,03\) nên O2 dư.
\(n_{Al_2O_3} = 0,5n_{Al} = 0,05(mol)\\ \Rightarrow m_{Al_2O_3} = 0,05.102 = 5,1(gam)\)
\(n_{Al}=\dfrac{2,7}{27}=0,1\left(mol\right)\)
\(n_{O_2\left(đktc\right)}=\dfrac{2,24}{22,4}=0,1\left(mol\right)\)
PTHH: \(4Al+3O_2\rightarrow2Al_2O_3\)
Ta có tỉ lệ: \(\dfrac{0,1}{4}< \dfrac{0,1}{3}\)
-> \(O_2\) sẽ dư sau phản ứng.
Theo pthh: \(n_{Al_2O_3}=\dfrac{2}{4}n_{Al}=\dfrac{1}{2}.0,1=0,05\left(mol\right)\)
-> \(m_{Al_2O_3}=0,05.102=5,1\left(g\right)\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(V_{kk}=33,6l\Rightarrow V_{O_2}=6,72l\Rightarrow n_{O_2}=0,3mol\Rightarrow m_{O_2}=9,6g\)
BTKL: \(m_M=m_{sp}-m_{O_2}=20,4-9,6=10,8g\)
\(4M+3O_2\underrightarrow{t^o}2M_2O_3\)
\(\dfrac{10,8}{M}\) 0,3
\(\Rightarrow\dfrac{10,8}{M}\cdot3=0,3\cdot4\Rightarrow M=27\Rightarrow Al\)
![](https://rs.olm.vn/images/avt/0.png?1311)
$\rm k)2KMnO_4 \xrightarrow{t^o} K_2MnO_4 + MnO_2 + O_2 \uparrow$
$\rm l)CH_4 + 2O_2 \xrightarrow{t^o} CO_2 + 2H_2O$
$\rm m)2Al + 3H_2SO_4 \rightarrow Al_2(SO_4)_3 + 3H_2 \uparrow$
$\rm n)Na_2CO_3 + CaCl_2 \rightarrow CaCO_3 \downarrow + 2NaCl$
$\rm o)2Na + 2H_2O \rightarrow 2NaOH + H_2 \uparrow$
$\rm p)CaO + 2HNO_3 \rightarrow Ca(NO_3)_2 + H_2O$
$\rm q)P_2O_5 + 3H_2O \rightarrow 2H_3PO_4$
$\rm r)Zn + 2HCl \rightarrow ZnCl_2 + H_2 \uparrow$
$\rm s)4Al + 3O_2 \xrightarrow{t^o} 2Al_2O_3$
$\rm t)Ba(OH)_2 + 2HCl \rightarrow BaCl_2 + 2H_2O$
![](https://rs.olm.vn/images/avt/0.png?1311)
A: `N_2`
C: `NO`
D: `NO_2`
E: `HNO_3`
G: `NaNO_3`
\(\left(1\right)2NH_3+3CuO\underrightarrow{t^o}3Cu+N_2+3H_2O\)
\(\left(2\right)N_2+3H_2\underrightarrow{xt,t^o}2NH_3\)
\(\left(3\right)4NH_3+5O_2\underrightarrow{xt,t^o}6H_2O+4NO\)
\(\left(4\right)2NO+O_2\rightarrow2NO_2\)
\(\left(5\right)4NO_2+O_2+2H_2O\rightarrow4HNO_3\)
\(\left(6\right)HNO_3+NaOH\rightarrow NaNO_3+H_2O\)
\(n_{Al}=\dfrac{2.7}{27}=0.1\left(mol\right)\)
\(4Al+3O_2\underrightarrow{t^0}2Al_2O_3\)
\(0.1....0.075.....0.05\)
\(V_{O_2}=0.075\cdot22.4=1.68\left(l\right)\)
\(m_{Al_2O_3}=0.05\cdot102=5.1\left(g\right)\)
ta có: \(n_{Al}=0.1\left(mol\right)\)
PTHH
\(4Al+3O_2\underrightarrow{t^o}2Al_2O_3\)
4 3
0.1 x
\(=>x=0.075=n_{O_2}\)
\(=>V_{O_2}=0.075\cdot22.4=1.68\left(l\right)\)