Соединение кислорода-белый песок(sio₂)- вычислите молекулярную массу белого песка.

M(sio2)=28+32=60 грамм/моль

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Для начала добавить agno3 с аммиачной водой выпадет черный осадок ag2o 14nh4oh+18agno3=11h2o+9ag2o+16nh3no3 жавеливая вода даст белый творожистый осадок agno3+kcl=kno3+agcl бромная вода даст желтый творожистый осадок br2+h2o=hbr+hbro hbr+agno3=hno3+agbr сероводородная вода даст черный осадок ag2s h2s+2agno3=2hno3+ag2s чтобы отличить черный осадок получившиеся в реакции с аммиачной водой, от черного осадка получившегося в реакции с сероводородной водой, к этим надо добавить к ним бромную воду. аммиачная вода обесцветит бромную воду, а в склянке с сероводородной водой выпадет осадок желтого цвета br2+h2o=hbr+hbro nh4oh+hbr=h2o+nh4br  h2s+br2=2hbr+s