posted by .

hen 9.3 g of an unknown non-electrolyte is dissolved in 50.0 g of benzene, the boiling point the boiling point increased to 81.19 degrees C from 80.1 degrees C. If the Kbp of the solvent is 2.53 K/m, calculate the molar mass of the unknown solute.
The answer is 432. I don't know how

  • chemistry -

    delta T = Kb*molality
    Solve for molality

    molality = moles/kg solvent
    Solve for moles.

    moles = grams/molar mass
    solve for molar mass.

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. chem- molar weight

    I worked this problem, I would like to know if I did it correctly, I think I missed something, I'm not sure..... When a 20.0 gram sample of an unknown compound is dissolved in 500 grams of benzene, the freezing pointof the resulting …
  2. Chemistry II

    Eugenol, the active ingredient in cloves, has a formula of C10H12O2. What is the boiling point of a solution containing 1.14g of eugenol dissolved in 10.0g of benzene?
  3. Orgo chem

    I have to find the boiling point of an unknown from a distillation experiment. The boiling ranges from 88.0 degrees Celsius to 94 degrees Celsius How can you find the boiling point when the points are graphed?
  4. Chemistry

    Which of the following statements about boiling points are false: A. the boiling point of 0.1 m KF(aq) is lower than the boiling point of 0.1 m ethanol(aq) B. the boiling point of a 0.5 m aqueous solution of NaOH is the same as the …
  5. Chemistry Science

    A 15.0 g sample of an unknown compound is dissolved in 100.0 g of benzene. The boiling point is raised 2.67 oC above the boiling point of pure benzene. What is the molar mass of the sample?
  6. Chemistry

    A 1.065-g sample of an unknown substance is dissolved in 30.00 g of benzene; the freezing point of the solution is 4.25 degrees C. The compound is 50.69% C, 4.23% H, and 45.08% O by mass. Info you might need on benzene: Normal Freezing …
  7. chemistry

    What is the expected freezing point of a 3.50 m (m standing for molality)aqueous solution of BaCl2(Kfp= 1.86 degrees Celsius/m)?
  8. Chemistry

    When 100.0 g of an unknown nonelectrolyte is dissolved in 500.0 g of benzene, C6H6, the solution boils at 82.9°C. Calculate the molecular weight (molar mass) of the unknown material. Kb for benzene is 2.53°C/m and the boiling point …
  9. Chemistry

    When 0.354 g of an unknown nonelectrolyte compound was dissolved in 12.5 g of benzene a solution was formed that froze at 4.46 degrees C. Calculate the molar mass of the unknown compound. The freezing point of benzene if 5.48 degrees …
  10. Chm Help Please!!!

    What is the boiling point of a solution of benzene contain 0.2 moles of a non volatile solute in 125 grams of benzene given that pure benzene has a b.p. of 80.1 Celcius and a Kbp of +2.53 C/m. Thanks!

More Similar Questions