Table of Contents
Which liquid has the lowest vapor pressure?
The graph shows that propanone has the greatest vapor pressure at any given temperature compared to the other three liquids, while ethanoic acid has the lowest vapor pressure at any given temperature compared to the other three liquids.
Is the vapor pressure of water low?
The high surface tension of water (water “sticks” to itself, so it doesn’t “want to” evaporate) means water has a low vapor pressure. Vapor pressure is constant when there is an equilibrium of water molecules moving between the liquid phase and the gaseous phase, in a closed container.
Which of the following should have the lowest vapor pressure?
The substance with the strongest intermolecular forces would be expected to have the lowest vapor pressure. Both NH3 and H2O exhibit hydrogen bonding whereas the others have only dispersion and/or dipole-dipole interactions.
Which liquid has the highest vapor pressure?
methyl chloride
Relation to boiling point of liquids For example, at any given temperature, methyl chloride has the highest vapor pressure of any of the liquids in the chart.
Why does water have such a low vapor pressure explain?
Vapor Pressure. The hydrogen bonding between liquid water molecules explains why water has an unusually low vapor pressure. Relatively few molecules of water are capable of escaping the surface of the liquid and enter the vapor phase. Evaporation is slow and thus the vapor exerts a low pressure in a closed container.
What is the highest vapor pressure?
Diethyl ether
Diethyl ether has a very small dipole and most of its intermolecular attractions are London forces. Although this molecule is the largest of the four under consideration, its IMFs are the weakest and, as a result, its molecules most readily escape from the liquid. It also has the highest vapor pressure.
What is the vapor pressure of HCL?
603 psia
It is very hydroscopic (attracts moisture) and in moist air, forms white fumes which are a mist of hydrochloric acid. The boiling point of AHCl at one atmosphere pressure (14.7 psia, 760 mmHg) is -85°C (-121°F) and the vapor pressure of AHCl at ambient temperature of (20°C, 68°F) is 603 psia.
What has the highest vapor pressure?
Which is an example of a vapor pressure?
The Macroscopic View The vapor pressure of a liquid is the equilibrium pressure of a vapor above its liquid (or solid); that is, the pressure of the vapor resulting from evaporation of a liquid (or solid) above a sample of the liquid (or solid) in a closed container. Examples: substance vapor pressure at 25oC diethyl ether 0.7 atm bromine 0.3 atm
How does the vapor pressure of a liquid change with temperature?
The vapor pressure of a liquid varies with its temperature, as the following graph shows for water. The line on the graph shows the boiling temperature for water. As the temperature of a liquid or solid increases its vapor pressure also increases.
What is the equilibrium pressure of a liquid?
The Macroscopic View. The vapor pressure of a liquid is the equilibrium pressure of a vapor above its liquid (or solid); that is, the pressure of the vapor resulting from evaporation of a liquid (or solid) above a sample of the liquid (or solid) in a closed container.
What is the vapor pressure of water over ice?
The vapor pressure of water is the pressure at which water vapor is in thermodynamic equilibrium with its condensed state. If we raise the pressure and keep the temperature, the water will condense. Two formulas have a version for vapor pressure of water over ice (so for temperatures below 0 °C).