Which substance has a higher vapor pressure?
When comparing vapor pressures we need to be making comparisons at the same temperature. Thus at room temperature, the substance with the lowest boiling point will have the highest vapor pressure (easiest to get into the gas phase). The substance with the highest boiling point will have the lowest vapor pressure.
Does water have a higher 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 diethyl ether vapor pressure?
vapor pressure at 25oC diethyl ether. 0.7 atm.
Which has stronger intermolecular forces liquid water or water vapor?
Vapor pressure is inversely related to intermolecular forces, so those with stronger intermolecular forces have a lower vapor pressure. Water has very strong intermolecular forces, hence the low vapor pressure, but it’s even lower compared to larger molecules with low vapor pressures.
How do Imfs affect vapor pressure?
A liquid’s vapor pressure is directly related to the intermolecular forces present between its molecules. The stronger these forces, the lower the rate of evaporation and the lower the vapor pressure.
Why does alcohol have a higher vapor pressure than water?
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. Due to its smaller size, ethanol exhibits weaker dispersion forces than diethyl ether.
Which has higher vapor pressure glycerol or water?
arealsurface area ratios) water molecules diffusing from inside the glycerol to the surface evaporate together with glycerol molecules, leading to an apparently higher vapor pressure.
Which factors affect vapor pressure for liquids?
Vapor pressure is the pressure caused by the evaporation of liquids. Three common factors that influence vapor press are surface area, intermolecular forces and temperature.