March 28, 2017

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If 395.3 g of a substance is dissolved in 872.6 g of cyclohexane solvent, the boiling point of the solution is 87.38 oC. Calculate the apparent molar mass (g/mol) of substance.

  • Chemistry - ,

    Find delta T. That is the difference between the normal boiling point of cyclohexane and 87.38.
    delta T = i*Kb*molality
    You have delta T, look up Kb (the constant for cyclohexane), and calculate molality.
    Then molality = moles/kg
    You know molality and kg. Calculate moles.
    Finally, moles = grams/molar mass. You know moles and grams, calculate molar mass. This will be the apparent molar mass since you don't know anything about i

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