a) \(M_A=0,552.29=16\left(g/mol\right)\)
\(CTTQ:C_xH_y\)
Theo đề bài, ta có: \(\frac{12x}{75}=\frac{1y}{25}\)
\(\Leftrightarrow300x=75y\)
\(\Leftrightarrow\frac{x}{y}=\frac{75}{300}=\frac{1}{4}\)
\(\Rightarrow x=1;y=4\)
\(\Rightarrow CTĐGN:CH_4\)
Mặt khác: \(\left(CH_4\right)_n=16\)
\(\Leftrightarrow\left(12+1.4\right).n=16\)
\(\Rightarrow n=1\)
\(\Rightarrow CTHH:CH_4\)
b) \(n_{CH4}=\frac{11,2}{22,4}=0,5\left(mol\right)\)
\(CH_4+2O_2\underrightarrow{t^O}CO_2+2H_2O\)
0,5______1___0,5______1(mol)
\(V_{O_2}=1.22,4=22,4\left(l\right)\)