Предмет: Химия, автор: cruster

при растворении 49,7 г высшего оксида элемента 5 группы в воде образовалось 68,6 г трехосновной кислоты установиьь формулу оксида и кислоты

Ответы

Автор ответа: udodovi

49,7г 68,6
Э2О5+3Н2О=2Н3ЭО4
2х + 80 2х + 134
(2х+80)*68,6=49,7*(2х+134)
137,2х + 5488= 99,4х + 6659,8
137,2х -99,4х = 6659,8 - 5488
37,8х = 1171,8
х=31
Ar(P)=31 г/моль
Это фосфор
P2O5
H3PO4

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