4Al+3O₂ = 2Al₂O₃
M (Al₂O₃) = 27*2 + 16*3 = 102 г/моль
w (Al) = 27*2 / 102 * 100% = 53%
w (O) = 100% - 53% = 47%
4Al+3O₂ = 2Al₂O₃
M (Al₂O₃) = 27*2 + 16*3 = 102 г/моль
w (Al) = 27*2 / 102 * 100% = 53%
w (O) = 100% - 53% = 47%