The vapour pressure of water at 50.0°C is 92.50 torr. When 12.6 g of glycerol are dissolved in 494 g of water, the vapour pressure is lowered to 92.04 torr. (a) What is the molar mass of glycerol? (b) What is the molecular formula of glycerol (a compound containing C, H, and O) from the following combustion analysis: when 2.00 g glycerol are combusted, 2.865 g CO₂ and 1.564 g H₂O are recovered.

5.152g of Na2CO3(s) is added to 75.0mL of water at 21.20°C. When the dissolution is complete, the final temperature of the solution is measured at 25.00°C. The final volume of the solution is 75.8mL, and the density of water at 21.20°C is 0.99798g/mL. Identify the strongest intermolecular force present in Na2CO3(s): and in water:

The boiling point of chloroform, CHCl3, is 61.70°C at 1 atmosphere. A nonvolatile, nonelectrolyte that dissolves in chloroform is aspirin.A student dissolves 14.17 grams of aspirin, C9H8O4 (180.1 g/mol), in 238.1 grams of chloroform. Use the table of boiling and freezing point constants to answer the questions below. Solvent Formula Kb (°C/m) Kf (°C/m) Water H2O 0.512 1.86 Ethanol CH3CH2OH 1.22 1.99 Chloroform CHCl3 3.67   Benzene C6H6 2.53 5.12 Diethyl ether CH3CH2OCH2CH3 2.02   The molality of the solution is ____________ m.The boiling point of the solution is  _________________°C.

A sample of 3.929 g of polystyrene was dissolved in toluene and diluted to a total volume of 100.8 mL. The osmotic pressure of this solution at 25.0°C was 44.56 torr. What is the molar mass?

The Rast method uses camphor (C10H160) as a solvent for determining the molar mass of a compound. When 3.26 g of unknown compoud are dissolved in 85.70 g of camphor (Kf = 40.0 °C/m), the freezing point of the mixture is 170.30 °C; that of pure camphor is 178.40°C. What is the molar mass of unknown compound? Express your answer with 4 decimal places.

If dissolving 1.5 g of a solute into 100 mL of water caused the temperature of the solution toincrease by 4.7 ⁰C, what would the change of temperature be if 3.0 g of the solute were dissolvedin the same volume of water? Explain.

If dissolving 1.5 g of a solute into 100 mL of water caused the temperature of the solution toincrease by 4.7 ⁰C, what would the change of temperature be if 3.0 g of the solute were dissolvedin the same volume of water? Explain.

In a laboratory experiment, students synthesized a new compound and found that when 11.40 grams of the compound were dissolved to make 160.5 mL of a ethanol solution, the osmotic pressure generated was 6.03 atm at 298 K. The compound was also found to be nonvolatile and a non-electrolyte.   What is the molecular weight they determined for this compound?