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Q&A: Support with empirical and molecular formulas?

Posted on 31 January 2014 by admin

Question by Andie: Support with empirical and molecular formulas?
The ratio of carbon atoms to hydrogen atoms to oxygen atoms in a molecule of THC (tetrahydrocannabinol) is 11:15:1. The molecular mass of THS is 326 g/mol. What is the molecular formula for THC?

Best answer:

Answer by bob_the_chemist
The usual resolution chemistry teachers want is

work out the empirical formula mass = 11 x 12 + 15x 1 + 16 = 163g

which is 163 / 326 or 1/2 molar mass so there are two empirical units in a mole of the compound

the molecular formula is then two x the empirical formula or

C22H30O2

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