Chemistry question help? ?

The percentage composition of a compound is found to be 39.9% carbon, 6.70% hydrogen and 53.4% oxygen. What is the empirical formula? 

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  • 4 weeks ago

    Convert the percentages to grams out of 100:

    39.9g C

    6.70g H

    53.4g O

    Convert these into moles by dividing by molar mass

    3.325 moles C (12 g/mole)

    6.70 moles H (1 g/mole)

    3.3375 moles O (16 g/mole)

    So the ratio is 3.325 moles C : 6.70 moles H : 3.3375 moles O.

    Because it's empirical formula (simplified ratios), we simplify this down. 6.7 is about 2x the other numbers

    1 C : 2 H : 1 O

    COH2

    Source(s): Took organic 1+2 chemistry last year
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