Дано
EO3
w(O) = 60% = 0.6
Решение
w(O) = 3Ar(O) / (Ar(E) + 3Ar(O)) = 3 * 16 / (Ar(E) + 3 * 16) = 48 / (Ar(E) + 48) = 0.6
48 / (Ar(E) + 48) = 0.6
48 = 0.6(Ar(E) + 48)
48 = 0.6Ar(E) + 28.8
19.2 = 0.6Ar(E)
Ar(E) = 32
E - сера
SO3
ответ: сера
