CHEMISTRY- PLEASE HELP:)!

Pure lauric acid is melted and the freezing point is determined to be 43 degrees celsius.

A solution is made by dissolving .50 grams of paradicholrobenzene into 3.00 grams of lauric acid.
Determine the molality of this solution. I got 1.1m. which is right.

But then it says the freezing point of the mixture is measured and found to be 39 degrees celsius. Then it says... determine the freezing poitn constant (kf) for lauric acid. how do i do that?

  1. 👍 0
  2. 👎 0
  3. 👁 75
asked by Miley
  1. delta T = Kf*m
    You know delta T (43-39) and you know m. Calculate Kf.

    1. 👍 0
    2. 👎 0

Respond to this Question

First Name

Your Response

Similar Questions

  1. Chemistry

    Calculate the expected freezing point of a solution of 0.579 g pelargonic acid in 4.225 g of lauric acid, if the melting point of pure lauric acid was measured to be 43.20*C. (MM pelargonic acid = 158.2 g/mol; MM laruic acid =

    asked by Amanda on February 11, 2017
  2. 7th Science

    the addition of 50 g of salt to a sample of pure water causes its freezing point to be reduced from 0.0 degrees Celsius to -3.15 degrees Celsius. determine how many degrees the freezing point dropped for every 10 g of salt added.

    asked by randomchik on September 26, 2012
  3. chemistry

    0.24 grams of benzene (C6H6) is dissolved into 4.9 grams of melted biphenyl. The freezing point of the mixture was determined to be 4.4 degrees below the freezing point of pure biphenyl. Based on these results, what is the Kf of

    asked by Erin on November 13, 2012
  4. Chemistry

    0.15 grams of benzene (C6H6) is dissolved into 4.7 grams of melted biphenyl. The freezing point of the mixture was determined to be 4.7 degrees below the freezing point of pure biphenyl. Based on these results, what is the Kf of

    asked by Taylor on November 25, 2014
  5. Chemistry

    3.92g of a nondissociating compound are dissolved in 400.g of liquid benzene. The freezing point of the solution is 5.19 degrees celsius. Calculate the molar mass of the compound. (The freezing point of the pure benzene is 5.50

    asked by Cassie on March 20, 2011
  6. Chemistry

    If the freezing point of a pure solvent is 6.00 degrees Celsius, will the solvent which is contaminated with a soluble material have a freezing point (higher than, lower than or same as) 6.00 degrees Celsius? Explain.

    asked by G on March 14, 2011
  7. Chemistry

    Pure benzene has a normal freezing point of 5.50 degrees Celsius. A solution containing 11.4 grams of a molecular substance dissolved in 150.0 grams of benzene (Kf=5.12C/m) has a freezing point of 1.20 degrees Celsius. What is the

    asked by Katelynn on March 22, 2010
  8. Chemistry

    Colligative Properties The freezing point of distilled water was determined by recording a thermogram: -0.176 degrees Celsius. The freezing point of a 0.200 m (molality) solution containing an unknown, ionic compound was

    asked by Sam on January 28, 2014
  9. chemistry... please help!

    Pure glacial acetic acid HC2H3O2 has a freezing point of 16.62 degrees C. Its freezing point depression constant is Kf=3.57 Cm^-1. A solution was made by taking 9.755 g of an unknown non-electrolyte and dissolving it in 90.50 g of

    asked by Anonymous on February 13, 2009
  10. chemistry

    1) The color of bromocresol green indicator is??? when pH < 4, green when pH 4- 5.3 and ???? in pH > 5.3. 2)(A) A student performed the freezing point depression experiment according to directions but mistakenly recorded the mass

    asked by chris on April 5, 2008

More Similar Questions