Chemistry Assignment Help With Molecular Speeds
Molecular SpeedsThere are three important kinds of molecular speeds
Most Probable Speedurms = crms =
A much precise representation would be
urms = crms =
Also crms = = = , d is the density of the gas.
It is the arithmetic mean of various speeds of the molecules
ua = Ca = Average speed =
= 0.9213 × cRMS
RMS = 1.085 × cav
Most Probable Speed
The speed possessed by maximum number of molecules of a gas at a given temperature is the most probable speed.
um = = × RMS
= 0.816 × CRMS
CRMS = 1.224 × CMPS
Hence Cm : Ca : Crms
= : : = 1 : 1.128 : 1.225
It is observed that molecular velocity of any gas is proportional to the square root of the absolute temperature. The molecular motion, is therefore, a thermal motion of the molecules. At absolute zero (i.e. T = 0) KE = 0. In other words thermal motion ceases completely at absolute zero.
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