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    shortstuff001's Avatar
    shortstuff001 Posts: 16, Reputation: 1
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    #1

    Mar 16, 2009, 05:25 PM
    Amount in moles of a pure substance
    Calculate the amount of pure substance present (in moles) of a 10.00 kg bag of table sugar (C6H12O6)
    The answer is supposed to be 29.21 mol, I can't seem to get this answer. Can someone give me the formula used? Thank you:o
    Perito's Avatar
    Perito Posts: 3,139, Reputation: 150
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    #2

    Mar 16, 2009, 08:48 PM

    Molecular Weight of C6H12O6 is 6*12 + 12*1 + 6*16 = 180

    So, with 180 grams/mole

    10,000 grams / 180 grams per mole = 55.56 moles.

    Unless someone's pulling your leg.

    To get 29.21 moles from 10.00 Kg the molecular weight would have to be

    10000/29.21 = 342.35 g/mole (1.9 times as much). So, unless the formula is different from that stated, the "answer" is wrong.
    shortstuff001's Avatar
    shortstuff001 Posts: 16, Reputation: 1
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    #3

    Mar 17, 2009, 05:13 PM

    Thanks I got 55.56mol also, the teacher gave us the wrong answer phew!

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