Molar Mass and Colligative Properties

The video tutorial explains how to calculate the final boiling and freezing points of a solution after adding a solute. It begins with the initial conditions and explains the effect of solutes on vapor pressure, boiling, and freezing points. The tutorial then details the steps to calculate molality, molar mass, and moles of the solute. Finally, it applies these calculations to determine the changes in boiling and freezing points, providing a comprehensive understanding of the process.

What is the initial boiling point of water in the given problem?

• 50°C

• 100°C

• 150°C

• 0°C

What happens to the boiling point when a solute is added to a solvent?

• It fluctuates

• It increases

• It remains the same

• It decreases

Why is it necessary to find the molality before applying the boiling and freezing point formulas?

• To determine the density

• To find the temperature

• To calculate the volume

• To use it in the formulas

How is the molar mass of ethylene glycol calculated?

• By subtracting atomic masses of its atoms

• By multiplying its density by volume

• By dividing its mass by volume

• By adding atomic masses of its atoms

What is the molar mass of ethylene glycol used in the problem?

• 44 g/mol

• 62 g/mol

• 18 g/mol

• 100 g/mol

How do you convert milliliters of water to kilograms?

• Subtract 1000

• Add 1000

• Multiply by 1000

• Divide by 1000

What is the molality of the solution calculated in the problem?

• 1.0 mol/kg

• 0.71 mol/kg

• 1.5 mol/kg

• 0.5 mol/kg

What is the change in boiling point after adding the solute?

• 0.44°C

• 1.6°C

• 0.5°C

• 2.0°C

What is the final boiling point of the solution?

• 100.44°C

• 99.56°C

• 98.4°C

• 101.6°C

What is the final freezing point of the solution?

• -2.0°C

• -0.44°C

• 0°C

• -1.6°C