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posted by  craigm13 on 11/10/2007 12:24:35 PM  |  status: Live  

Kinetic theory

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The question is find the rms speed of a nitrogen molecule at 20 degrees C. Why, in order to find the mass of the nitrogen molecule, do we use 2(14.0067) x 10 -3 kg/mol/ 6.02 x 10^23/mol. I understand dividing by avogadro's number, and using the atomic mass number for nitrogen, but I don't understand multiplying by 2 x 10 -3? Why do we do that? Conversion to SI units?
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posted by ktqu on 11/10/2007 12:36:44 PM  |  status: Live
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craigm13's comment:
"Ah, thank you"
Response Details:
You multiply by 2 because a nitrogen molecule is N2 so you have to account for both nitrogens. You multiply by 10-3 to convert from grams to kilograms.
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