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

Ta có: \(m_C=2\cdot92\%=1,84\left(kg\right)\) \(\Rightarrow n_C=\dfrac{1,84}{12}=\dfrac{23}{150}\left(kmol\right)=n_{O_2}\)

\(\Rightarrow m_{O_2}=\dfrac{23}{150}\cdot32\approx4,91\left(kg\right)\)

Đề có phải thiếu: "Còn lại là Cacbon"

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

C + O2 => CO2

1,06m³ = 1060 (l) => nCO2 = \(\frac{1060}{22,4}=47,32mol\)

nC = nCO2 = 47,32 mol

=> mC = 47,32.12 = 567,84 (g)

m than đá = 0,6kg = 600g

=> % C = \(\frac{567,84}{600}.100\%\) = 94,64%

C + O₂ CO₂

1,00mol 1,00mol

47,3 mol = 47,3 (mol)

Phần trăm khối lượng của C trong mẫu than đá: = 94,6%

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

      C     +     O2     →     CO2

      47,32                 ←     47,32 (mol)

Theo pt: nC = nCO2 = 47,32 mol ⇒ mC = 47,32. 12 = 567,84 g

% khối lượng của C là:

C + O₂ \(\xrightarrow[]{t^o}\) CO₂

nCO₂ = \(\dfrac{1,06}{22,4}\approx0,047mol\)

Theo pt: nC = nCO₂ = 0,047 mol

=> mC = 0,047.12 = 0,564g

%mC = \(\dfrac{0,564}{0,6}.100\%=94\%44\)

$C  + O_2 \xrightarrow{t^o} CO_2$

n C = n CO2 = 1,06/22,4 = 53/1120(mol)

m C = 53/1120  .12 = 0,568(gam)

Suy ra : 

%C = 0,568/0,6  .100% =94,67%

a)

\(n_{CO_2}=\dfrac{16,8}{22,4}=0,75\left(mol\right)\)

PTHH: C + O₂ --t^o--> CO₂

       0,75<-0,75<-----0,75

=> Độ tinh khiết = \(\%C=\dfrac{0,75.12}{10}.100\%=90\%\)

b) 

\(n_{SO_2}=\dfrac{0,56}{22,4}=0,025\left(mol\right)\)

PTHH: S + O₂ --t^o--> SO₂

    0,025<-0,025<---0,025

=> \(V_{O_2\left(PTHH\right)}=\left(0,025+0,75\right).22,4=17,36\left(l\right)\)

=> \(V_{O_2\left(tt\right)}=\dfrac{17,36.110}{100}=19,096\left(l\right)\)

Câu 1:

\(m_{CaO(\text {phản ứng})}=\dfrac{50,4}{90\%}=56(g)\\ \Rightarrow n_{CaO}=\dfrac{56}{56}=1(mol)\\ PTHH:CaCO_3\xrightarrow{t^o}CaO+CO_2\\ \Rightarrow n_{CaCO_3}=1(mol)\\ \Rightarrow m_{CaCO_3}=100.1=100(g)\\ \Rightarrow m_{\text {đá vôi}}=\dfrac{100}{90\%}\approx 111,11(g)\)

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:

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