General Chemestry

Diacetyl, a substance contributing to characteristic flavor and aroma of butter, consist of 55.8% C, 7.03% H, and 37.17% O. In the gaseous state at 100 C and 747 torr, a 0.30 gram sample occupies a volume of 111ml. What is the molacular formula of diacetyl?

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asked by Aisha
  1. Say we had 100 grams of this stuff
    Then that would be
    55.8 g of C
    7.03 g of H
    37.17 g of O
    divide each by atomic weight to get ratio of atoms in molecule
    C --> 55.8/12 = 4.65
    H --> 7.03/1 = 7.03
    O --> 37.17/16 = 2.32
    about three H for every O
    about two C for every O
    so molecule of form:
    C2x H3x Ox
    and the molecular mass of a mole will be:
    16 x + 3x + 24 x = 43 x grams per mole
    NOW
    find out how many moles you have from
    n = P V
    /(RT)
    we know it weighs .3 grams per n moles
    so find out how many grams per mole
    then set that equal to 43 x and solve for x

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    posted by Damon

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