Final answer:
Under surface pressure and temperature conditions, alkanes are formed as gases.
Step-by-step explanation:
Under surface pressure and temperature conditions, alkanes are formed as gases. Alkanes are a type of aliphatic hydrocarbon that contain only single covalent bonds. They are relatively stable, nonpolar molecules that do not react with acids, bases, or oxidizing or reducing reagents. Examples of alkanes that are gases at surface pressure and temperature conditions include methane (CH4), ethane (C2H6), and propane (C3H8).