Problem: What is the mole fraction of oxygen gas in air (see table 5.3 in the textbook)?

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We are asked what is the mole fraction of oxygen gas in air. 


O2 is 21% and N2 79% by mass in air.


Assume 100 g air. 


There will be 21 g O2 and 79g N2.


Calculate moles each: 

mol O2 = 21 g O2 ×1 mol  O232.00 g O2  = 0.66 mol O2 mol N2 = 79 g N2 ×1 mol  N228.02 g N2 = 2.82 mol N2


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What is the mole fraction of oxygen gas in air (see table 5.3 in the textbook)?

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