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(Almost) ideal air

Page history last edited by Joe Redish 9 years, 3 months ago

7.1.P7

 

The air we breathe is essentially 78% nitrogen (mass 28 Daltons per molecule) and 22% oxygen (32 Daltons). Consider the air as approximately described as an ideal gas. SATP = standard ambient temperature and pressure (T = 300 K, P = 1 atmosphere).

 

A. Can you say what the temperature of one oxygen molecule is in air at SATP? If you can, find it. If you can't, explain why not.

 

B. Find the ratio of the average speeds of an oxygen molecule to that of a nitrogen molecule at SATP. Show your work.

 

C. At SATP, 22.4 liters of air contains one mole of molecules. Can you use the ideal gas law (gas constant R = 8.3 Pa-m3/mol-K) to deduce what the pressure is at SATP? If you can, find it, showing your work. If you can't explain why not.

 

 

 

Alan Peel 11/3/14

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