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Osmotic pressure and stoichiometry

  1. Apr 6, 2015 #1
    1. The problem statement, all variables and given/known data
    When 0.32 weight/volume% of sucrose, MgSO4 and KNO3 mixture is dissolved in 997 g of H2O, the osmotic pressure at 25 deg Celsius is 1.25 atm. Calculate the mole fraction and mass percent composition of the original mixture if it contains 15% weight/weight KNO3.

    2. Relevant equations

    Osmotic pressure= Molarity x Gas constant x Temperature in Kelvin


    3. The attempt at a solution
    I was able to solve for the molarity of the solution. After it, I don't know what to do next. Can someone please teach me what the next step is and what is the role(meaning) of weight/volume % and weight/weight % in the problem? Thank you in advance. :)
     
  2. jcsd
  3. Apr 6, 2015 #2

    Borek

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    Staff: Mentor

    I have no idea what it means.
     
  4. Apr 9, 2015 #3
    My friend told me that when you multiply the given percentage by 100, you will get the total mass of the mixture. I am just not sure whether I should believe him or not.
     
  5. Apr 9, 2015 #4

    Borek

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    Staff: Mentor

    Doesn't sound correct to me. 30% sulfuric acid doesn't always weight 3000 (and 3000 of what? stones? grams? ounces? pounds?).
     
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