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March 30, 2017

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A 1.73 g sample of a molecular compound
is dissolved in 105 g of tetrachloromethane
(carbon tetrachloride). The normal boiling
point of the solution is 61.51C, the normal
boiling point of CCl4 is 61.2C. The boiling
point constant for CCl4 is 4.95 K ยท kg/mol.
What is the molar mass of the compound?
Answer in units of g/mol

  • AP Chem - ,

    delta T = Kb*m
    Solve for m

    m = mols/kg solvent
    Solve for mols

    mols = grams/molar mass
    Solve for molar mass.

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