Verified answer

Ответ:

Объяснение:

Мr(P2O5) = Ar(P) * 2 + Ar(O) * 5 = 31 * 2 + 16 * 5 = 142

w(P) = Ar(P) * n/ Мr(P2O5) * 100% = 31 * 2/142 * 100% = 43,66%

w(O) = Ar(O) * n/Мr(P2O5) * 100% = 16 * 5/142 * 100% = 56,34%