Khối lượng cacbon có trong 5kg than trên là :

\(m_C=\dfrac{5.\left(100-4\right)}{100}=4,8kg=4800g\)
\(\rightarrow n_C=4800:12=400mol\)
\(C+O_2\rightarrow CO_2\)
400              400 mol
\(\Rightarrow V_{O2}=400.22,4=8960\) lít = 8,96 \(m^3\)
\(\Rightarrow\) Chọn A

m_C = 1000.95% = 950 (g)

PT: \(C+O_2\underrightarrow{t^o}CO_2\)

Ta có: \(n_C=\dfrac{950}{12}=\dfrac{475}{6}\left(mol\right)\)

Theo PT: \(n_{O_2}=n_{CO_2}=n_C=\dfrac{475}{6}\left(mol\right)\)

a+b, \(V_{O_2}=V_{CO_2}=\dfrac{475}{6}.22,4\approx1773,33\left(l\right)\)

\(n_C=\dfrac{7,5.96\%}{12}=0,6\left(mol\right)\\ C+O_2-^{t^o}\rightarrow CO_2\\ n_{O_2}=n_C=0,6\left(mol\right)\\ \Rightarrow V_{O_2}=0,6.22,4=13,44\left(l\right)\)

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c 896 m^3 nhé 

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Ta có: \(m_C=1,5.1000.90\%=1350\left(g\right)\)

\(n_C=\dfrac{1350}{12}=112,5\left(mol\right)\)

PT: \(C+O_2\underrightarrow{t^o}CO_2\)

Theo PT: \(n_{O_2}=n_C=112,5\left(mol\right)\)

\(\Rightarrow V_{O_2}=112,5.22,4=2520\left(l\right)\)

\(V_{kk}=V_{O_2}.5=12600\left(l\right)\)

B1:

\(n_C=\dfrac{96\%.14.1000}{12}=1120\left(mol\right)\\ n_S=\dfrac{2,56\%.14.1000}{32}=11,2\left(mol\right)\\ C+O_2\rightarrow\left(t^o\right)CO_2\\ S+O_2\rightarrow\left(t^o\right)SO_2\\ n_{SO_2}=n_S=11,2\left(mol\right)\\ n_{CO_2}=n_C=1120\left(mol\right)\\ V_{CO_2\left(đktc\right)}=1120.22,4=25088\left(l\right)\\ n_{SO_2\left(đktc\right)}=11,2.22,4=250,88\left(l\right)\)

B2:

\(n_{C_2H_6}=\dfrac{1,8.\left(100\%-2\%\right).1000}{22,4}=78,75\left(mol\right)\\ C_2H_6+\dfrac{7}{2}O_2\rightarrow\left(t^o\right)2CO_2+3H_2O\\ n_{O_2\left(đktc\right)}=\dfrac{7}{2}.78,75=275,625\left(mol\right)\\ V_{O_2\left(đktc\right)}=275,625.22,4=6174\left(l\right)=6,174\left(m^3\right)\)

→⎧⎪ ⎪⎨⎪ ⎪⎩nC=60012=50(mol)nS=832=0,25(mol)→{nC=60012=50(mol)nS=832=0,25(mol)

PTHH:

C + O₂ ---t^o----> CO₂

_{50.....50.......................................(mol)}

S + O₂ ----t^o---> SO₂

^{0,25...0,25 ............................................(mol)}

→ VO2VO2 _{(cần dùng)} = (50 + 0,25) . 22,4 = 1125,6 (l)

=>Vkk=1125.6.5=5628l

 C_{nguyên chất} = (100%-10%).1000 = 900 (g)

\(n_C=\dfrac{900}{12}=75\left(mol\right)\)

PTHH: C + O₂ ---t^o→ CO₂

Mol:    75    75

\(V_{O_2}=75.22,4=1680\left(l\right)\)

\(m_{CO_2}=75.44=3300\left(g\right)\)

Ta có: m_C = 7,5.(100 - 4)% = 7,2 (g)

\(\Rightarrow n_C=\dfrac{7,2}{12}=0,6\left(mol\right)\)

PT: \(C+O_2\underrightarrow{t^o}CO_2\)

Theo PT: \(n_{O_2}=n_C=0,6\left(mol\right)\Rightarrow V_{O_2}=0,6.24,79=14,874\left(l\right)\)