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PT: \(CH_4+2O_2\underrightarrow{t^o}CO_2+2H_2O\)
Ta có: \(n_{CH_4}=\dfrac{30,9875}{24,79}=1,25\left(mol\right)\)
a, \(n_{H_2O}=2n_{CH_4}=2,5\left(mol\right)\) \(\Rightarrow m_{H_2O}=2,5.18=45\left(g\right)\)
b, \(n_{O_2}=2n_{CH_4}=2,5\left(mol\right)\) \(\Rightarrow V_{O_2}=2,5.24,79=61,975\left(l\right)\)
Mà: O2 chiếm 1/5 thể tích không khí.
\(\Rightarrow V_{kk}=5V_{O_2}=309,875\left(l\right)\)
\(n_{H_2}=\dfrac{13,44}{22,4}=0,6mol\)
\(2H_2+O_2\rightarrow\left(t^o\right)2H_2O\)
0,6 0,3 0,6 ( mol )
\(m_{H_2O}=0,6.18=10,8g\)
\(V_{kk}=V_{O_2}.5=\left(0,3.22,4\right).5=33,6l\)
2H2+O2-to>2H2O
0,1----0,05----0,1
n H2=0,1 mol
=>m H2OI=0,1.18=1,8g
=>Vkk=0,05.22,4.5=5,6l
a) CH4 + 2O2 --to--> CO2 + 2H2O
b) \(V_{O_2}=\dfrac{56}{5}=11,2\left(l\right)\)
=> \(n_{O_2}=\dfrac{11,2}{22,4}=0,5\left(mol\right)\)
PTHH: CH4 + 2O2 --to--> CO2 + 2H2O
_____0,25<--0,5-------->0,25
=> VCH4 = 0,25.22,4 = 5,6 (l)
c)
mCO2 = 0,25.44 = 11 (g)
nMg = 7,2/24 = 0,3 (mol)
PTHH: 2Mg + O2 -> (t°) 2MgO
Mol: 0,3 ---> 0,15 ---> 0,3
VO2 = 0,15 . 22,4 = 3,36 (l)
Vkk = 3,36 . 5 = 16,8 (l)
mMgO = 0,3 . 40 = 12 (g)
a, \(CH_4+2O_2\underrightarrow{t^o}CO_2+2H_2O\)
b, \(n_{CH_4}=\dfrac{28}{22,4}=1,25\left(mol\right)\)
\(n_{CO_2}=n_{CH_4}=1,25\left(mol\right)\Rightarrow m_{CO_2}=1,25.44=55\left(g\right)\)
c, \(n_{O_2}=2n_{CH_4}=2,5\left(mol\right)\Rightarrow V_{O_2}=2,5.22,4=56\left(l\right)\)
$a\big)$
$n_{Fe}=\frac{16,8}{56}=0,3(mol)$
$3Fe+2O_2\xrightarrow{t^o}Fe_3O_4$
Theo PT: $n_{Fe_3O_4}=\frac{1}{3}n_{Fe}=0,1(mol)$
$\to m_{Fe_3O_4}=0,1.232=23,2(g)$
$b\big)$
Theo PT: $n_{O_2}=\frac{2}{3}n_{Fe}=0,2(mol)$
$\to V_{O_2}=0,2.22,4=4,48(l)$
$\to V_{kk}=4,48.5=22,4(l)$
$c\big)$
$2KMnO_4\xrightarrow{t^o}K_2MnO_4+MnO_2+O_2$
Theo PT: $n_{KMnO_4}=2n_{O_2}=0,4(mol)$
$\to m_{KMnO_4(dùng)}=\frac{0,4.158}{80\%}=79(g)$
a, \(n_{Fe}=\dfrac{16,8}{56}=0,3\left(mol\right)\)
PTHH: 3Fe + 2O2 ---to→ Fe3O4
Mol: 0,3 0,2 0,1
\(m_{Fe_3O_4}=0,1.232=23,2\left(g\right)\)
b, \(V_{O_2}=0,2.22,4=4,48\left(l\right)\Rightarrow V_{kk}=4,48.5=22,4\left(l\right)\)
c,
PTHH: 2KMnO4 ---to→ K2MnO4 + MnO2 + O2
Mol: 0,4 0,2
\(m_{KMnO_4\left(lt\right)}=0,4.158=63,2\left(g\right)\)
\(\Rightarrow m_{KMnO_4\left(tt\right)}=\dfrac{63,2}{80\%}=79\left(g\right)\)
a/ PTHH : 2C2H6 + 7O2 → 6H2O + 4CO2
nC2H6 = 13,44 / 22,4 = 0,6 mol
=> nO2 = 2,1 mol
=> VO2 = 2,1 x 22,4 = 47,04 lít
=> VKK = 47,04 : 0,2 = 235,3 lít
b/ => nCO2 = 1,2 mol
=> mCO2 = 1,2 x 44 = 52,8 gam
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