The question
Name: ______________________ Date: ____________ Two amines with the same formula (4 points)
Data table
Two isomers of C₃H₉N
Propylamine and trimethylamine have the same molecular formula, C₃H₉N, and molar mass 59.11 g/mol. In propylamine two H atoms are bonded to the N atom; in trimethylamine the N atom is bonded to three carbon atoms and to no H.
| Compound | Structure | Boiling point (°C) |
|---|---|---|
| Propylamine | CH₃CH₂CH₂NH₂ | 48 |
| Trimethylamine | (CH₃)₃N | 3 |
(a) Identify all the types of intermolecular force between molecules of liquid propylamine. [1 point]
(b) Explain why propylamine has the higher boiling point. Your answer must refer to both compounds. [2 points]
(c) At 25 °C, which liquid has the higher vapor pressure? Justify your answer. [1 point]