Vapor Pressure

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Simon Dionson 4I
Posts: 107
Joined: Sat Sep 14, 2019 12:17 am

Vapor Pressure

Postby Simon Dionson 4I » Fri Nov 08, 2019 6:05 pm

What is the relationship between the strength of intermolecular forces and vapor pressure?

Alan Wu
Posts: 61
Joined: Sat Sep 14, 2019 12:16 am

Re: Vapor Pressure

Postby Alan Wu » Fri Nov 08, 2019 6:50 pm

Vapor pressure is a measure of the pressure exerted by a gas above a liquid in a sealed container. Strong intermolecular forces produce a lower rate of evaporation and a lower vapor pressure. Weak intermolecular forces produce a higher rate of evaporation and a higher vapor pressure.

Ryan Chang 1C
Posts: 105
Joined: Sat Aug 24, 2019 12:17 am

Re: Vapor Pressure

Postby Ryan Chang 1C » Sat Nov 09, 2019 11:06 am

Vapor pressure is correctly defined in the post above. Knowing what vapor pressure is can help you solve problems like 3F.19 part (b) Explain why the vapor pressure of diethyl ether (C2H5OC2H5) is greater than that of water.

Since water has hydrogen bonds and C2H5OC2H5 does not, the molecules are held together tighter in water, thus giving water a lower vapor pressure.

Return to “Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)”

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