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nK=0,2(mol)
PTHH: 4K + O2 -to-> 2 K2O
nK2O= 0,1(mol) => mK2O=0,1.94=9,4(g)
nO2=0,05(mol) -> V(O2,đktc)=0,05.22,4=1,12(l)
V(kk,dktc)=5.V(O2,dktc)=5.1,12=5,6(l)
\(a,CH_4+2O_2\rightarrow\left(t^o\right)CO_2+2H_2O\)
Vì n và V tỉ lệ thuận với nhau. Nên ta có:
\(V_{O_2}=2.V_{CH_4}=2.2,768=5,536\left(l\right)\)
\(b,V_{kk}=\dfrac{100}{21}.V_{O_2}=\dfrac{100}{21}.5,536=\dfrac{2768}{105}\left(l\right)\)
a) \(n_{CO_2}=\dfrac{3,36}{22,4}=0,15\left(mol\right)\)
PTHH: \(CH_4+2O_2\xrightarrow[]{t^o}CO_2+2H_2O\)
0,15<---0,3<----0,15
b) `m_{O_2} = 0,3.32 = 9,6 (g)`
c) `V_{CH_4} = 0,15.22,4 = 3,36 (l)`
CH4+2O2-to>CO2+2H2O
0,075---0,15
n O2=\(\dfrac{3,36}{22,4}\)=0,15 mol
=>VCH4=0,075.22,4=1,68l
\(n_{O_2}=\dfrac{3,36}{22,4}=0,15mol\)
\(CH_4+2O_2\rightarrow\left(t^o\right)CO_2+2H_2O\)
0,075 0,15 ( mol )
\(V_{CH_4}=0,075.22,4=1,68l\)
Ta có: \(n_{CH_4}=\dfrac{4,48}{22,4}=0,2\left(mol\right)\)
PT: \(CH_4+2O_2\underrightarrow{t^o}CO_2+2H_2O\)
Theo PT: \(n_{O_2}=2n_{CH_4}=0,4\left(mol\right)\)
\(\Rightarrow m_{O_2}=0,4.32=12,8\left(g\right)\)
\(n_{Fe}=\dfrac{16,8}{56}=0,3\left(mol\right)\\ a,3Fe+2O_2\rightarrow\left(t^o\right)Fe_3O_4\\ b,n_{O_2}=\dfrac{2}{3}.0,3=0,2\left(mol\right)\\ \Rightarrow V_{O_2\left(đktc\right)}=0,2.22,4=4,48\left(l\right)\\ c,n_{Fe_3O_4}=\dfrac{0,3}{3}=0,1\left(mol\right)\\ \Rightarrow m_{Fe_3O_4}=0,1.232=23,2\left(g\right)\)
a)
$CH_4 + 2O_2 \xrightarrow{t^o} CO_2 + 2H_2O$
b) Theo PTHH : $V_{O_2} = 2V_{CH_4} = 11,2(lít)$
$n_{CH_4} = \dfrac{5,6}{22,4} = 0,25(mol)$
Theo PTHH : $n_{H_2O} = 2n_{CH_4} = 0,5(mol)$
$m_{H_2O} = 0,5.18 = 9(gam)$
\(a,CH_4+2O_2\rightarrow CO_2+2H_2O\)
\(1:2:1:2\left(mol\right)\)
\(0,25:0,5:0,25:0,5\left(mol\right)\)
\(n_{CH_4}=\dfrac{V}{22,4}=\dfrac{5,6}{22,4}=0,25\left(mol\right)\)
\(b,V_{O_2}=n.22,4=0,5.22,4=11,2\left(l\right)\)
\(m_{H_2O}=n.M=0,5.18=9\left(g\right)\)