Дано
ClxOy
w(Cl) = 38.8% = 0.388
Решение
w(O) = 1 - w(Cl) = 1 - 0.388 = 0.612
w(Cl) = xAr(Cl) / (xAr(Cl) + yAr(O)) = 35.5x / (35.5x + 16y) = 0.388
35.5x = 0.388(35.5x + 16y)
35.5x = 13.774x + 6.208y
35.5x - 13.774x = 6.208y
35.5x - 13.774x = 6.208y
21.726x = 6.208y
3.5x = y
7x = 2y
x : y = 2 : 7
Ответ: Cl2O7