Ответ:
Mr(CaO)=40+16=56
W(Ca)=40÷56=71%
W(O)=16÷56=29%
71%+29%=100%
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Ответ:
Mr(CaO)=40+16=56
W(Ca)=40÷56=71%
W(O)=16÷56=29%
71%+29%=100%