\(n_{O_3} = a ; n_{O_2} = b(mol)\\ M_A = 19,2.2 = 38,4(g/mol)\\ m_{khí} = 48a + 32b = 7,68\\ n_{khí} = a + b = \dfrac{7,68}{38,4} = 0,2\\ \Rightarrow a = 0,08 ; b = 0,12\\ \%V_{O_3} = \dfrac{0,08}{0,2}.100\% = 40\% \Rightarrow \%V_{O_2} = 100\% -40\% = 60\%\\ m_{O_3} = 0,08.48 = 3,84(gam) ; m_{O_2} = 0,12.32 = 3,84(gam)\)