Problem: Part AWhat is the mole fraction of oxygen gas in air (see table 5.3 in the textbook)? Part BWhat volume of air contains 12.1 g of oxygen gas at 273 K and 1.00 atm? Express your answer using two significant figures. 

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Part A

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

Part B

What volume of air contains 12.1 g of oxygen gas at 273 K and 1.00 atm? 

Express your answer using two significant figures.