Answer:
ch3oh
Step-by-step explanation:
The vapor pressure of a liquid is inversely proportional to its boiling point. The lower the boiling point, the higher the vapor pressure.
Out of the given molecules, CH4 (methane) has the lowest boiling point (-161.5°C) and hence, the highest vapor pressure.
C6H13NH2 (hexylamine), CH3OH (methanol), and C5H11OH (pentanol) all have higher boiling points than methane and lower vapor pressures.
Of these three, methanol (CH3OH) has the lowest boiling point (-64.7°C) and hence the highest vapor pressure, making it the molecule with the lowest vapor pressure out of the given options.