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Solubility

Discussion in 'MCAT Study Question Q&A' started by DeathandTaxes, May 16, 2014.

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  1. DeathandTaxes

    DeathandTaxes 5+ Year Member

    104
    19
    Jan 29, 2012
    An aqueous solution was prepared by mixing 70 grams of sugar (C12H12O11) into 100 grams of water. The solution has a boiling point of 101.11 and Kb = 0.512, what is the molar mass of the solute?

    The answer is 322.58, but I don't understand why we can't just do (12*12 + 12 + 11*16) since they give us the molecular formula.
     
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  3. Czarcasm

    Czarcasm Hakuna matata, no worries. 2+ Year Member

    966
    405
    Jun 22, 2013
    Crypts of Lieberk├╝hn
    Lol, I thought the same. Stupid question.
     
  4. Hadi7183

    Hadi7183 2+ Year Member

    63
    22
    Dec 8, 2013
    NWT
    The main purpose of those extra pieces of information is just to distract you. This is actually a common bait in the MCAT. In this case, it was too obvious that you don't need those information to answer the question, but in more complex questions this trick can easily hunt you.
     
  5. DeathandTaxes

    DeathandTaxes 5+ Year Member

    104
    19
    Jan 29, 2012
    Hadi, if you use the molecular formula you actually get something greater than 322. So the extra pieces of information were necessary to solving the problem

    This was from Kaplan's General Chemistry review btw.
     
  6. DrknoSDN

    DrknoSDN

    450
    104
    Feb 21, 2014
    ... How do you figure?

    12*12 = 144
    16*11 = 176
    1*12=12
    144+176+12=332.
     

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