Answer: Dimethyl ether will have the higher vapor pressure and the lower boiling
point.
Explanation: Water is a polar substance with strong intermolecular hydrogen bonds.
Dimethyl ether is a polar material with weaker intermolecular forces (dipole–dipole). It will
172 Step 4. Review the Knowledge You Need to Score High
Solid
Liquid
Gas
Pressure
Temperature
Triple point
Deposition
Sublimation
Fusion
(Melting)
Freezing
Vaporization
Condensation
Critical
D Bpoint
A
C
Figure 12.4 A phase diagram.
Figure 12.5 Phase diagram for H 2 O.
Pressure (atm)
Temperature (°C)
− 1 100
Triple point
(0.01°C, 0.006 atm)
Critical point
(374°C, 218 atm)
1.0
SOLID LIQUID
GAS