Vapour pressure of liquid solutions

The video tutorial explains the concept of vapor pressure using hot chocolate as an example. It describes how vapor pressure is measured with a manometer and discusses its behavior in solutions of volatile liquids. The tutorial covers Dalton's and Raoult's laws, relating vapor pressure to mole fractions, and compares Raoult's law to Henry's law. It also explores the vapor pressure of solutions with non-volatile solutes, emphasizing the impact of solute quantity on vapor pressure.

Why can you smell hot chocolate from a distance?

• Because it is in a solid state

• Because it is in a frozen state

• Because it is in a gaseous state

• Because it is in a vapor state

What is the role of the manometer in measuring vapor pressure?

• It measures density

• It measures volume

• It measures displacement of mercury

• It measures temperature

What does Raoult's Law state about the vapor pressure of a solution?

• It is inversely proportional to mole fractions

• It is directly proportional to mole fractions

• It is equal to the sum of mole fractions

• It is independent of mole fractions

What happens to the vapor pressure when two volatile liquids are mixed?

• It becomes the difference of their individual vapor pressures

• It becomes the average of the two

• It becomes zero

• It becomes the sum of their individual vapor pressures

In Raoult's Law, what is the relationship between partial pressure and mole fraction?

• Partial pressure is equal to mole fraction

• Partial pressure is inversely proportional to mole fraction

• Partial pressure is directly proportional to mole fraction

• Partial pressure is unrelated to mole fraction

According to Dalton's Law, what is the total pressure over a solution?

• The product of the partial pressures

• The difference of the partial pressures

• The sum of the partial pressures

• The average of the partial pressures

How does adding a non-volatile solute affect the vapor pressure of a solvent?

• It has no effect on the vapor pressure

• It doubles the vapor pressure

• It decreases the vapor pressure

• It increases the vapor pressure