Question

Determine the molality of a solution of ethanol dissolved in methanol for which the mole fraction of ethanol is 0.397. Give your answer to 2 decimal places

Calculate the boiling point (in degrees C) of a solution made by dissolving 6.81 g of sucrose (C12H22O11) in 99.7 g of acetone. The Kbp of the solvent is 1.71 K/m and the normal boiling point is 56.2 degrees C. Give your answer to 2 decimal places

When 11.8 g of an unknown, non-volatile, non-electrolyte, X was dissolved in 100. g of methanol, the vapor pressure of the solvent decreased from 122.7 torr to 115 torr at 298 K. Calculate the molar mass of the solute, X.

Determine the molality of a solution prepared by dissolving 24.2 g of glucose in 70.3 g of water. Give your answer to 2 decimal places.

When 5.54 g of an unknown non-electrolyte is dissolved in 50.0 g of carbon tetrachloride, the boiling point increased by 3.48 degrees C. If the K_bp of the solvent is 4.95 K/m, calculate the molar mass of the unknown solute.

How many moles of solute particles are present in 7.76 mL of 0.736 M K₃PO₄? take the LOG (base 10) of your answer and put it in using 2 decimal places

Determine the molality of a solution of methanol dissolved in water for which the mole fraction of methanol is 0.228. Give your answer to 2 decimal places

Answer 1

Calculate the boiling point (in degrees C) of a solution made by dissolving 6.81 g of sucrose (C12H22O11) in 99.7 g of acetone. The Kbp of the solvent is 1.71 K/m and the normal boiling point is 56.2 degrees C. Give your answer to 2 decimal places

m = 6.1 g of sucrose

MW = 342.2965

mol = m/MW = 6.1/342.2965 = 0.017820

m = 99.7 acetone = 0.0997 kg acetone

molal = moll/kg solvent = 0.017820/0.0997 = 0.1787 molal

dTb = Kb*m

dTb = 1.71*0.1787 = +0.305°C

Tb = 56.2 + 0.305 = 56.505°C

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