Calculate the freezing and boiling point of a solution CHEM HELP?

Calculate the freezing point and boiling point of a solution containing 12.8 g of naphthalene (C10H8) in 104.0 mL of benzene. Benzene has a density of 0.877 g/cm3

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  • 4 weeks ago
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  • david
    Lv 7
    4 weeks ago

    find the molality of the solution

       1 .. find molar mass of C10H8  =  ???

       2.  moles of C10H8  ...  12.8 / molar mass =  ???

       3.  find kilograms of benzene ..  104.0 X 0.877 / 1000  .... use a calculator

       4.  find molality of the solution ..  answer 2 / answer 3

    =============================

       5.  use the formula ,,,

        delta T  =  molal freexing point depression constant  X  molality  (answer from 4)

      ... 6 ... look up normal freexing point of pure benzene  ....  then subtract  delta T (answer 5)

    =======  similarly for boiling point elevation

     ...  you have the book with all the constants, I don't.  This is how to do it.

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