Vapor Pressure and Ideal Mixtures

The video tutorial explains vapor pressure, focusing on Raoult's Law and its application to liquid mixtures. It covers how the vapor pressure of a component in a mixture is calculated using its mole fraction and the vapor pressure of the pure component. The tutorial also discusses the concept of ideal and non-ideal mixtures, highlighting that ideal mixtures obey Raoult's Law, while non-ideal mixtures deviate due to significant intermolecular attractions. Examples of chemically similar mixtures, like hexane and heptane, are provided to illustrate ideal behavior.

What is the vapor pressure of a pure liquid represented by?

• P3

• P2

• P1

• P0

How does mixing a liquid with another affect its vapor pressure?

• Doubles the vapor pressure

• Increases the vapor pressure

• Has no effect on the vapor pressure

• Decreases the vapor pressure

What law helps calculate the vapor pressure of a component in a mixture?

• Avogadro's Law

• Charles's Law

• Boyle's Law

• Raoult's Law

In Raoult's Law, what does the vapor pressure of a component depend on?

• Density

• Mole fraction

• Temperature

• Volume

If the mole fraction of a component is 0.5, what fraction of molecules in the mixture are of that component?

• 0.25

• 0.5

• 0.75

• 1.0

What is the total pressure in a vapor mixture composed of?

• Only the pressure of component B

• Only the pressure of component A

• The sum of the partial pressures of all components

• The difference between the pressures of A and B

What is an ideal liquid mixture defined by?

• Obeying Avogadro's Law

• Obeying Raoult's Law

• Obeying Boyle's Law

• Obeying Charles's Law

Why do liquid mixtures deviate more from ideal behavior than gases?

• Due to significant intermolecular attractions

• Due to higher volume

• Because of higher temperature

• Because of lower pressure

Which type of liquid mixtures behave most like ideal mixtures?

• Mixtures of chemically dissimilar components

• Mixtures of chemically similar components

• Mixtures with high temperature

• Mixtures with low pressure

What is an example of a mixture that behaves ideally?

• Acetone and water

• Oil and water

• Hexane and heptane

• Water and ethanol