Kinetic Molecular Model of Gases: Assumptions, Pressure, and Velocity Distribution, Lecture notes of Physical Chemistry

o Assumption

1) Gas molecules in ceaseless random motion (no phase change).

2) Molecular size is negligible (no repulsion).

3) Molecules do not interact (no attraction).

All gases at same P and T have the sam properties.

o Definition of Pressure

“gas pressure is caused by collective collision of gas molecules with container’s wall”

Middle of container

Let V = volume of container and N = number of molecules at equilibrium

𝑁 2

𝐴 ≡ surface area of a wall

Force exerted on right wall per second

|𝐴

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