# science

A solution is prepared by dissolving 0.490 g of an unknown compound in 50.00 mL of water. The freezing point of the solution is –0.201°C. Assuming the compound is a non-electrolyte, what is the molecular mass of the compound? Use 1.00 g/mL as the density of water.

1. 👍
2. 👎
3. 👁
1. delta T = 0-(-.201) = ?
delta T = Kf*m
You know delta T and Kf, solve for m = molality.
m = mols/kg solvent. You know kg solvent and m, solve for mols.

mols = grams/molar mass. You know grams and mols, solve for molar mass.

1. 👍
2. 👎
2. 90.74

1. 👍
2. 👎

## Similar Questions

1. ### chemistry! URGENT

A standard solution is prepared for the analysis of fluoxymesterone (C20H29FO3), an anabolic steroid. A stock solution is first prepared by dissolving 10.0 mg of fluoxymestrone in enough water to give a total volume of 500.0 ml. A

2. ### chemistry

A solution is prepared by dissolving 0.5842g of oxalic acid (H2C2O4) in enough water to make 100.0ml of solution. A 10.00ml aliquot (portion) of this solution is then diluted to a final volume of 250.0ml. What is the final

3. ### Chemistry

An unknown compound contains only carbon, hydrogen, and oxygen. Combustion analysis of the compound gives mass percents of 31.57% Carbon and 5.30% H. The molar mass is determined by measuring the freezing-point depression of an

4. ### Chemistry

A solution is prepared by dissolving 23.7 g of CaCl2 in 375 g of water. The density of the resulting solution is 1.05 g/mL. The concentration of Cl- in this solution is __________ M. can someone help me? how do i get to M?

1. ### chemistry

an aqueous solution containing 17.5g of an unknown molecular(nonelectrolyte) compound in 100.0g of water has a freezing point of 1.8 degress C. calculate the molar mass of the unknown compound

2. ### Chemistry

Calculate the molarity of a solution prepared by dissolving 10.0 grams of NaOH and then diluting the solution to 500mL.

3. ### Chemistry

The freezing point of a cyclohexane sample is 6.20*C. A soltuion is prepared by dissolving 0.4660g of an unknown solute in 36.0g cyclohexane. The freezing point of the solution if 4.11*C. Calculate the molar mass of the unknown

4. ### Chemistry

Calculate the pH of a solution prepared by dissolving 12.2 g of benzoic acid in enough water to produce a 500 mL solution. Ka = 6.3 x 10^-5

1. ### general, organic and biochemistry

when a solution prepared by dissolving 4.00g of an unknown monoprotic acid in 1.00L of water is titrated with 0.600M NaOH, 38.7mL of the NaOH solution is needed to neutralize the acid. What was the molarity of the acid solution?

2. ### Chemistry

A solution is prepared by dissolving 5.00g of an unknown molecular solid in water to make 500 ml of solution. The osmotic pressure of the solution is 1.61 atm at 25 degrees C. What is the molar mass of the solute? This is what ive

3. ### Chemistry

What is the molarity of this dichromate solution? A potassium dichromate solution of an unknown molarity was used to titrate a solution of FeSO4 prepared by dissolving a 0.350g of pure iron wire in H2SO4 and reducing the FE3+

4. ### chemistrey

What is the molarity of a solution prepared by dissolving 8 grams of BaCl2 in enough water to make a 450.0 mL solution?