Question

Find the molecular formula of a compound that is 48.38% carbon, 8.12% hydrogen, and 53.5% oxygen by mass and has a molecular weight of 328 g/mol.
Take a 100 g sample to give you
48.38 g C
8.12 g H
53.5 g O.
Convert grams to mols. mols = grams/molar mass
uh oh! Percent adds up to more than 100% (110% to be exact about it). You must have made a typo or the problem is printed wrong. My best educated guess is that 53.5% O should be 43.5% O.

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