Calculate the empirical formula of a compound that is 42.9% Carbon and 57.1% Oxygen.

Question

Calculate the empirical formula of a compound that is 42.9% Carbon and 57.1% Oxygen.

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Thiên Ân 3 months 2021-08-09T12:08:17+00:00 1 Answers 0 views 0

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    2021-08-09T12:09:18+00:00

    Answer:

    CO.

    Explanation:

    Assuming the given percentages are by mass, we can solve this problem via imagining we have 100 g of the compound, if that were the case we would have:

    • 42.9 g of C
    • 57.1 g of O

    Now we convert those masses into moles, using the elements’ respective molar masses:

    • 42.9 g of C ÷ 12 g/mol =  3.57 mol C
    • 57.1 g of O ÷ 16 g/mol =  3.58 mol O

    As the number of C moles and O moles is roughly the same, the empirical formula for the compound is CO.

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