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[Solved] Molecular formula of a compound?

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Friday, 29 October 2010 03:19

QUESTION
i got the empirical formula already. and i know the molar mass. i need to find out what the empirical formula mass is, but i don't know how to find that. please help.
ANSWER
you've done the hard work! Now you have to take the molecular weight of the empirical formula and divide the molar mass by it.

For example, say CH2O would be 180 gmol and your empirical formula adds up to 30 gmol. 180 / 30 = 6, so you'd multiply everything by that factor, 6.

CH2O then becomes C6H12O6, or our friendly glucose!
  Science & Mathematics - Chemistry

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