Consider a sample of oxygen at 300 K. Find the average time taken by a molecule of travel a distance equal to the diameter of the earth.
In kinetic theory of ideal gas, the average energy is given by
Where R=gas constant=8.31Jmol-1K-1
T=temperature of gas
M=molar mass of gas
Given
Temperature T=300K
Molar mass of oxygen=32amu=32g/mol=3210-3 kg/mol
Therefore
We know that
Distance here is given as diameter of earth
Now radius of earth = 6400km=6400000m
Diameter=2radius
So, diameter of earth =26400000m
So, time taken
1 hour=6060 seconds=3600seconds
So, 28747.83s =h = 7.98h
8h
So, average time taken by oxygen molecule to travel a distance
equal to the diameter of the earth is 7.98h8h.