Question

Which of the following would have the lowest average kinetic energy?

Cl2 gas at 35 °C

F2 gas at 15 °C

O2 gas at 25 °C

N2 gas at 50 °C

Answer 1

Temperature is defined as the average kinetic energy of the molecules in a sample. Because of that, we know that the sample that has the lowest temperature will have the smallest average kinetic energy. I hope this helps. Let me know in the comments if anything is unclear.

Answer 2

The correct answer is F2 gas at 15 degree C.

Step-by-step explanation:

On the basis of the kinetic theory of gases, all the gases at a specific temperature possess the same average kinetic energy. The average kinetic energy of the gases can be determined with the help of the relation, K = 3R / 2NA * T

Here, K is the average kinetic energy,

R is the gas constant and NA is the Avogadro's number (6.023 * 10^23 atoms /mol)

T is the temperature in Kelvin

It is evident from the relation that K relies upon the temperature. Thus, F2 gas at 15 degree C exhibits the lowest average kinetic energy as it is at the lower temperature in comparison to the other gases.