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\(n_{Fe}=\dfrac{5.6}{56}=0.1\left(mol\right)\)
\(2Fe+\dfrac{3}{2}O_2\underrightarrow{t^0}Fe_2O_3\)
\(0.1.......0.075.....0.05\)
\(V_{O_2}=0.075\cdot22.4=1.68\left(l\right)\)
\(m_{Fe_2O_3}=0.05\cdot160=8\left(g\right)\)
PTHH: \(4Fe+3O_2\underrightarrow{t^o}2Fe_2O_3\)
Ta có: \(n_{Fe}=\dfrac{5,6}{56}=0,1\left(mol\right)\)
\(\Rightarrow\left\{{}\begin{matrix}n_{O_2}=0,075\left(mol\right)\\n_{Fe_2O_3}=0,05\left(mol\right)\end{matrix}\right.\) \(\Rightarrow\left\{{}\begin{matrix}V_{O_2}=0,075\cdot22,4=1,68\left(l\right)\\m_{Fe_2O_3}=0,05\cdot160=8\left(g\right)\end{matrix}\right.\)
\(n_{Al}=\dfrac{2.7}{27}=0.1\left(mol\right)\)
\(4Al+3O_2\underrightarrow{t^0}2Al_2O_3\)
\(0.1....0.075.....0.05\)
\(V_{O_2}=0.075\cdot22.4=1.68\left(l\right)\)
\(m_{Al_2O_3}=0.05\cdot102=5.1\left(g\right)\)
\(V_{kk}=33,6l\Rightarrow V_{O_2}=6,72l\Rightarrow n_{O_2}=0,3mol\Rightarrow m_{O_2}=9,6g\)
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
\(\Rightarrow\dfrac{10,8}{M}\cdot3=0,3\cdot4\Rightarrow M=27\Rightarrow Al\)
$a\big)$
Bảo toàn KL:
$m_{O_2}=m_{CR}-m_{Fe}=11,84-11,2=0,64(g)$
$\to n_{O_2}=\frac{0,64}{32}=0,02(mol)$
$\to V_{O_2}=0,02.22,4=0,448(l)$
$b\big)$
$V_{kk}=5V_{O_2}=5.0,448=2,24(l)$
\(n_{CH_4}=\frac{V_{CH_4}}{22,4}=\frac{2,24}{22,4}=0,1\left(mol\right)\)
\(CH_4+2O_2\underrightarrow{t^o}CO_2+2H_2O\)
\(0,1\) \(0,2\) \(0,1\) \(0,2\left(mol\right)\)
a) \(V_{CO_2}=n_{CO_2}.22,4=0,1.22,4=2,24\left(l\right)\)
b) \(V_{CO_2}=\frac{1}{5}.V_{kk}\Rightarrow V_{kk}=5.V_{CO_2}=5.2,24=11,2\left(l\right)\)
câu 2
nC2H2 = 1,12/22,4 = 0.05 (mol)
2C2H2 + 5O2 --t*--> 4CO2 + 2H2O
0.05 ------------------------> 0.1
VCO2 = 0,1 . 22,4 = 2,24 (l)
Vkk = 2,24 . 100/20 = 11,2 (l)
Câu 2a, b, c
nC2H2= \(\dfrac{1,12}{22,4}\)=0,05 (mol)
PTHH: 2C2H2+ 5O2 -t->4 CO2+2H2O.
Mol: 2 : 5: 4: 2
Mol: 0,05
Theo PTHH=> nO2= \(\dfrac{0,05.5}{2}\)= 0,125(mol)
=>nKK=0,125:20%=0,625(mol)
=> VKK(đktc)= 0,625.22,4=14(l)
Theo PTHH ta lại có nCO2=\(\dfrac{0,05.4}{2}\)=0,1(mol)
=> VCO2= 0,1.22,4=2,24(l)
CHUSC BẠN HỌC TỐT NHÉ 
a) \(3Fe+2O_2\rightarrow Fe_3O_4\)
b) \(Fe_3O_4+8HCl\rightarrow FeCl_2+2FeCl_3+4H_2O\)
c) \(2NaHCO_3\rightarrow Na_2CO_3+CO_2+H_2O\)
d) \(2C_2H_2+5O_2\rightarrow4CO_2+2H_2O\)
Câu 1.
gọi x,y là số mol CO2, H20 => V H20/ V CO2 =5/4 =>y/x=5/4 => 5x-4y=0
Theo định luật bảo toàn khối lượng m CO2 + mH20= mA+ mO2=6.65g => 44x+ 18y=6.65
=>x= 0.1, y=0.125 mol
=>nC=0.1 mol
=>nH=0.25mol
=>mO=2.25-(0.1*12)-0.25=0.8g =>nO=0.05 mol
x:y:z= 0.1:0.25:0.05=2:5:1
=>CTPT (C2H5O)n
M (A)= 2*45=90 => n=2
CTPT là C4H10O2
Câu 2
\(n_{H_2O}=\dfrac{1.8}{18}=0.1\left(mol\right)\)
\(C_2H_2+\dfrac{5}{2}O_2\underrightarrow{t^0}2CO_2+H_2O\)
\(0.1.........0.25......0.2..........0.1\)
\(V_{C_2H_2}=2.24\left(l\right)\)
\(V_{O_2}=0.25\cdot22.4=5.6\left(l\right)\)
\(V_{CO_2}=0.2\cdot22.4=4.48\left(l\right)\)