Chemistry

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Portland cement contains some SiO2. Calculate the mass percent composition of silicon in this compound.

  • Chemistry -

    (atomic mass Si/molar mass SiO2)* 100 = ?% Si.

  • Chemistry -

    I did the fitrst part and got 46.7 but theresa second part of the question


    Small amounts of CoO are added to glass to give it a blue color. Calculate the mass percent composition of cobalt in this compound

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