M(HNO3)=1+14+16*3=63g/mol
W(O)=16*3/63*100%=76.19%
Ответ: 76.19%
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M(HNO3)=1+14+16*3=63g/mol
W(O)=16*3/63*100%=76.19%
Ответ: 76.19%