Дано
w(P) = 43.66% = 0.4366
w(O) = 56.34% = 0.5634
D(воздух) = 4.9
PxOy
Решение
Mr(PxOy) = Mr = D(воздух) * Mr(воздух) = 4.9 * 29 = 142.1
w(P) = xAr(P) / Mr = 31x / 142.1 = 0.4366
31x / 142.1 = 0.4366
31x / 142.1 = 0.4366
31x = 62
x = 2
y = (Mr - xAr(P)) / Ar(O) = (142.1 - 31 * 2) / 16 = 5
P2O5
Ответ: P2O5