Question

Atmospheric pressure decreases as altitude increases. In other words, there is more air pushing down on you at sea level, and there is less air pressure pushing down on you when you are on a mountain.
1. If hexane C6H14, octane C8H18, and octanol C8H17OH are heated evenly at different altitudes, rank them according to the order in which you would expect them to begin boiling.
A) Hexane at high altitude
B) Octane at high altitude
C) Octane at sea level
D) Octanol at sea level
Rank them from boils first to boils last.

Answer 1

Answer:

To boil, a liquid must overcome the attractive forces between molecules and the outside pressure pushing down on the liquid's surface.

(Octanol> Octane> Hexane)

Step 2: Identify which situation is most conducive to boiling

To boil, a liquid must overcome the attractive forces between molecules and the outside pressure pushing down on the liquid's surface.

In which situation would you expect the liquid to boil first, assuming equal heating.

(weak intermolecular attraction and low atmospheric pressure)

Boils first >Hexane at high altitude> Octane at high altitude>Octane at sea level> Octanol at sea level> boils last.

Explanation: