Kinetic Molecular Theory Of Gases

The average kinetic energy of a molecule is given by the equation:

K.E.%20%3D%20%5Cfrac%7B3%7D%7B2%7D%20k_B%20T

where: -

k_B

is the Boltzmann constant,

1.38%20%5Ctimes%2010%5E%7B-23%7D%20%5Ctext%7B%20J%2FK%7D

, -

T

is the temperature in Kelvin. The temperature in Kelvin is:

T%20%3D%2020%20%2B%20273%20%3D%20293%20%5Ctext%7B%20K%7D

Substituting the values:

K.E.%20%3D%20%5Cfrac%7B3%7D%7B2%7D%20%5Ctimes%20(1.38%20%5Ctimes%2010%5E%7B-23%7D)%20%5Ctimes%20293%20%3D%206.07%20%5Ctimes%2010%5E%7B-21%7D%20%5Ctext%7B%20J%7D

Thus, the correct answer is (C).

Chapter Questions
1 MCQs