CH16 notes part 2 - Chapter 16 Part 2: Liquids and Solids:...

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Chapter 16 Part 2: Liquids and Solids: CONDENSED phases of matter. VAPOR PRESSURE Consider a liquid in a closed container. There will be evaporation and condensation, and eventually an equilibrium will develop. Above the liquid will be vapor, which exerts a vapor pressure on the container walls. This is INDEPENDENT of the container dimensions as long as we have some liquid . Vapor pressure can be treated using Dalton's Law so P tot = VP + P a + P b +… where a and b are other gases. We tabulate VP for different liquids at different temperatures so you just look them up if you need them. VP is dependent on temperature. The attractive forces tend to encourage condensation and discourage evaporation but, at higher T, more particles can break free of the attractive forces in the liquid and join the vapor. Note: The STRONGER the intermolecular forces, the LOWER the vapor pressure of that liquid. Solids can have appreciable VP's as well… for example CO
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CH16 notes part 2 - Chapter 16 Part 2: Liquids and Solids:...

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