Đặt \(n_{O_2}=x;n_{CO_2}=y\)

\(n_X=\dfrac{4,48}{22,4}=0,2\left(mol\right)\Leftrightarrow x+y=0,2\) 

Ta có: \(16x+44y=\left(x+y\right).18.2\)

     \(\Leftrightarrow2y=5x\)

     \(\Leftrightarrow\dfrac{y}{5}=\dfrac{x}{2}\)

Mà x+y=0,2

\(\Rightarrow\dfrac{y}{5}=\dfrac{x}{2}=\dfrac{x+y}{5+2}=\dfrac{0,2}{7}=0,0286\)

\(\Rightarrow y=5.0,0286=0,143\left(mol\right);x=0,2-0,143=0,057\left(mol\right)\)

Gọi $n_{CO} = a(mol) ; n_{CO_2} = b(mol)$

Ta có : 

$n_X = a + b = 0,25(mol)$
$m_X = 28a + 44b = 18,8.2.0,25 = 9,4(gam)$

$\Rightarrow a = 0,1 ; b = 0,15

$\%n_{CO} = \dfrac{0,1}{0,25}.100\% = 40\%$
$\%n_{CO_2} = 100\% -40\% = 60\%$

\(C+H_2O-^{^{ }t^{^{ }0}}->CO+H_2\\ C+2H_2O-^{^{ }t^{^0}}>CO_2+2H_2\\ m_X=11,2:22,4.7,8.2=7,8g\\ n_{CO}=a;n_{CO_2}=b\Rightarrow n_{H_2}=a+2b\left(mol\right)\\ n_X=0,5=a+b+a+2b=2a+3b=0,5\left(I\right)\\ m_X=28a+44b+2a+4b=30a+48b=7,8\left(II\right)\\ \left(I\right)\left(II\right)\Rightarrow a=0,1=b\\ n_{CO}=n_{CO_2}=0,1mol\\ n_{H_2}=0,3mol\)

Đặt a, b lần lượt số mol O₂ và O₃ trong hh X. (a,b>0)

=> 22,4a+22,4b=8,96 (1)

Mặt khác: 

\(M_{hhX}=21.2=42\left(\dfrac{g}{mol}\right)\\ \Leftrightarrow\dfrac{32a+48b}{a+b}=42\left(2\right)\)

Từ (1), (2) giải hệ được: a=0,15(mol); b=0,25(mol)

=> \(n_{O_2}=0,15\left(mol\right);n_{O_3}=0,25\left(mol\right)\)

\(n_{CO_2}=\dfrac{6,6}{44}=0,15\left(mol\right)\\ n_{N_2}=\dfrac{3,36}{22,4}=0,15\left(mol\right)\\ n_{NO_2}=\dfrac{8,96}{22,4}=0,4\left(mol\right)\\ \overline{M}_X=\dfrac{m_X}{n_X}=\dfrac{0,15.44+0,15.28+0,4.46}{0,15+0,15+0,4}=\dfrac{29,2}{0,7}=\dfrac{292}{7}\left(\dfrac{g}{mol}\right)\\ \Rightarrow d_{\dfrac{X}{kk}}=\dfrac{\dfrac{292}{7}}{29}\approx1,438\)

Gọi: \(\left\{{}\begin{matrix}n_{H_2}=x\left(mol\right)\\n_{CO_2}=y\left(mol\right)\end{matrix}\right.\) \(\Rightarrow x+y=\dfrac{8,96}{22,4}=0,4\left(mol\right)\left(1\right)\)

Mà: d_Y/H2 = 6,25

\(\Rightarrow2x+44y=6,25.2.0,4\left(2\right)\)

Từ (1) và (2) \(\Rightarrow\left\{{}\begin{matrix}x=0,3\left(mol\right)=n_{H_2}\\y=0,1\left(mol\right)=n_{CO_2}\end{matrix}\right.\)

PT: \(2Al+6HCl\rightarrow2AlCl_3+3H_2\)

\(Na_2CO_3+2HCl\rightarrow2NaCl+CO_2+H_2O\)

Theo PT: \(n_{Al}=\dfrac{2}{3}n_{H_2}=0,2\left(mol\right)\)

\(n_{Na_2CO_3}=n_{CO_2}=0,1\left(mol\right)\)

\(\Rightarrow m=m_{Al}+m_{Na_2CO_3}=0,2.27+0,1.106=16\left(g\right)\)

Gọi số mol CO₂ và SO₂ là a, b (mol)

= >\(\left\{{}\begin{matrix}n_{khí}=a+b=\dfrac{8,96}{22,4}=0,4\left(mol\right)\\\dfrac{44a+64b}{a+b}=29,5.2=59\end{matrix}\right.\) => \(\left\{{}\begin{matrix}a=0,1\left(mol\right)\\b=0,3\left(mol\right)\end{matrix}\right.\)

\(n_{NaOH}=1.0,4=0,4\left(mol\right)\)

PTHH: NaOH + CO₂ --> NaHCO₃

________0,1<----0,1------->0,1_______(mol)

NaOH + SO₂ --> NaHSO3

_0,3<----0,3-------->0,3_____________(mol)

=> \(\left\{{}\begin{matrix}C_{M\left(NaHCO_3\right)}=\dfrac{0,1}{0,4}=0,25M\\C_{M\left(NaHSO_3\right)}=\dfrac{0,3}{0,4}=0,75M\end{matrix}\right.\)