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How they did


ramanan
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Well, they used the Kinetic Theory model, and did some maths to it.

 

Maxwell came up with the model for the root-mean-square (rms) molecular speed. It describes average molecular speed having a certain average molecular kinetic energy.

 

The equation is:

 

rms.jpg

 

u is the average molecular speed

R is the molar gas constant (8.3145 J / mol K).

T is the absolute temperature (K)

Mm is the Molar mass of the gas (g / mol)

 

Source: General Chemistry 7th. Ebbing, Gammon. p. 214. © 2002 by Houghton Mifflin Company.

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ramanan said in post #6 :

Mr.NSX I didn't get the equation. ps try to send me.

 

You mean it doesn't show up?

darn Geocities

:P

 

Well, in text form:

 

u = sqrt (3RT / Mm)

 

u is the average molecular speed

R is the molar gas constant (8.3145 J / mol K).

T is the absolute temperature (K)

Mm is the Molar mass of the gas (g / mol)

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