Three liquids are listed below.
• butane, CH₃CH₂CH₂CH₃ (molar mass = 58 g·mol⁻¹)
• dimethyl ether, CH₃OCH₃ (molar mass = 46 g·mol⁻¹)
• ethanol, CH₃CH₂OH (molar mass = 46 g·mol⁻¹)
Determine which liquid is expected to have the lowest vapor pressure at 25 °C and provide one sentence of justification.