Question

p-dichlorobenzene is an organic molecular (covalent) compound with i = 1 and Kf = 7.10 oC/m...

p-dichlorobenzene is an organic molecular (covalent) compound with i = 1 and Kf = 7.10 oC/m A student weighed 11.20 mL of p-dichlorobenzene and recorded mass of it as 10.820 g. The freezing point of the pure p-dichlorobenzene liquid was determined as 53.1 oC. 1.118 g of an unknown solid compound was added and completely dissolved in the previous sample of pure p-dichlorobenzene liquid. The freezing point determination procedure was conducted for the solution and the freezing point of this unknown compound / p-dichlorobenzene solution was calculated as 50.9 oC. What is Molar Mass (g/mol) of Unknown Compound

What is Molar Mass (g/mol) of Unknown Compound?

Group of answer choices

333

214

422

287

302

0 0
Add a comment Improve this question Transcribed image text
Answer #1

here we have used equation for the freezing point depression

Add a comment
Know the answer?
Add Answer to:
p-dichlorobenzene is an organic molecular (covalent) compound with i = 1 and Kf = 7.10 oC/m...
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Not the answer you're looking for? Ask your own homework help question. Our experts will answer your question WITHIN MINUTES for Free.
Similar Homework Help Questions
  • A student is determining the molar mass of an unknown compound based on the following data:...

    A student is determining the molar mass of an unknown compound based on the following data:   mass compound: 4.80 g             mass solvent (water): 0.022 kg             new freezing point: -2.50 oC             freezing point depression constant (Kf): 1.86 oC/molal (Freezing point of pure water = 0 oC) 0.0786 g/mol 162.33 g/mol 0.00616 g/mol 293.26 g/mol

  • A cyclohexane (c-hex) solution is prepared by fully dissolving 9.11g of a newly synthesized organic compound...

    A cyclohexane (c-hex) solution is prepared by fully dissolving 9.11g of a newly synthesized organic compound in 100.g cyclohexane. The freezing point of the solution is depressed by -5.80 oC from the normal freezing point of 6.55 oC for pure cyclohexane ( Kf,c-hex= 20.0 oC kg/mol , MWc-hex = 84.0 g/mol). (a) What is the molecular weight (molar mass) of the organic compound? (b) What is the vapor pressure of the cyclohexane for this solution at 298K?

  • The molar mass of unknown molecular compound is determined using freezing point depression. The substance is...

    The molar mass of unknown molecular compound is determined using freezing point depression. The substance is dissolved in benzene (C6H), an organic solvent. Use the data below to determine the molar mass of the substance. 8.65 g Mass of unknown compound Freezing point of solution Volume of benzene -10.21°C 35.0 mL 5.53°C Freezing point of benzene Density of benzene Kf for benzene 0.8765 g/mL 5.12°C/m Molar mass = g/mol

  • A solution containing 1.00 g of an unknown non-electrolyte liquid and 9.00 g water has a...

    A solution containing 1.00 g of an unknown non-electrolyte liquid and 9.00 g water has a freezing point of -3.33 oC. The Kf = 1.86 oC/m for water. Calculate the molar mass of the unknown liquid, in g/mol.

  • The molar mass of a compound expresses the ratio of mass to moles Part A molar...

    The molar mass of a compound expresses the ratio of mass to moles Part A molar mass- _mass in gr tert-Butyl alcohol is a solvent with a Kf of 9.10 °C/m and a freezing point of 25.5 °C. When 0.807 g of an unknown colorless liquid was dissolved in 11.6 g of tert-butyl alcohol, the solution froze at 15.3°C number of moles This quantity can be determined experimentally by accurately measuring the mass of the sample and determining the corresponding...

  • A solution is prepared by dissolving 3.04 g of an unknown nonelectrolyte in 16.00 g of...

    A solution is prepared by dissolving 3.04 g of an unknown nonelectrolyte in 16.00 g of cylcohexane (tf = 6.6 oC and kf = 20.0 oC/m). What is the molar mass of the unknown compound if the solution has a freezing point of -6.7 oC? Please see https://youtu.be/lwWZ5hdB61M for assistance. Mm = g/mol

  • When 12.6-grams of an unknown compound is placed in 0.116-kg of benzene, the freezing point is...

    When 12.6-grams of an unknown compound is placed in 0.116-kg of benzene, the freezing point is changed by 2.34°C. The value of Kf= 4.90°C/m for benzene. Determine the molar mass of the unknown compound. Answer to 1 decimal place and include your units. Answer: Determine the molality of a solution when 32.3 grams of ethanol, C2H5OH (Molar mass = 46.08 g/mol) is dissolved in 0.947 kg of water. Answer to 2 decimal places. Answer: Find the freezing point of a...

  • What is the molar mass of a nonpolar molecular compound if 6.34 g dissolved in 53.4...

    What is the molar mass of a nonpolar molecular compound if 6.34 g dissolved in 53.4 g benzene begins to freeze at 2.81 °C? The freezing point of pure benzene is 5.50 °C and the freezing point depression constant, Kf, is -5.12 °C/m. A. 2.26 x 10-4 g/mol B. 0.226 g/mol C. 12.1 g/mol D. 226 g/mol

  • A 12.5855 g sample of an unknown compound (X) is dissolved in 32.0000 g of water....

    A 12.5855 g sample of an unknown compound (X) is dissolved in 32.0000 g of water. The resulting solution has a freezing point of – 4.3oC. What is the molar mass of X?   Kf = 1.858 oC/m.

  • If you can please explain step by step for each question. Problem 1, Question 1. Cyclohexae,...

    If you can please explain step by step for each question. Problem 1, Question 1. Cyclohexae, C6H12, melts at 6.55 oC and has a freezing point depression constant of kfp = -20.0 oC/m (where m is molality). You want to determine the molar mass of an unknown pure compound using the colligative property of freezing point depression. You weigh out 83.561 g of cyclohexane, and confirm that its melting point is 6.55 oC. You then mix 2.566 g of your...

ADVERTISEMENT
Free Homework Help App
Download From Google Play
Scan Your Homework
to Get Instant Free Answers
Need Online Homework Help?
Ask a Question
Get Answers For Free
Most questions answered within 3 hours.
ADVERTISEMENT
ADVERTISEMENT