Question

Arrange the following gases in order of increasing average molecular speed at 25 degrees Celsius.

Cl₂, O₂, F₂, N₂

A) Cl₂ < O₂ < F₂ < N₂
B) N₂ < F₂ < Cl₂ < O₂
C) Cl₂ < F₂ < O₂ < N₂
D) F₂ < O₂ < N₂ < Cl₂
E) Cl₂ < F₂ < N₂ < O₂

Answer 1

To arrange the given gases in order of increasing average molecular speed at 25 degrees Celsius, we need to consider their molecular masses. The gas with the lowest molar mass will have the highest average molecular speed.

Step-by-step explanation:

The average molecular speed of a gas is directly related to its temperature. The higher the temperature, the faster the molecules will move on average. Therefore, to arrange the given gases in order of increasing average molecular speed at 25 degrees Celsius, we need to consider their molecular masses. The gas with the lowest molar mass will have the highest average molecular speed.

The molecular masses of the given gases are: Cl₂ (71.0 g/mol), O₂ (32.0 g/mol), F₂ (38.0 g/mol), N₂ (28.0 g/mol)

Arranging the gases in order of increasing molecular mass, we get: N₂ < O₂ < F₂ < Cl₂. Therefore, the correct answer is option B) N₂ < F₂ < Cl₂ < O₂.