Problem: A gas mixture contains 1.26 g N2 and 0.86 g O2 in a 1.56-L container at 18 oC.You want to reference (Pages 216 - 222) Section 5.6 while completing this problem.Calculate the mole fraction of O2.

FREE Expert Solution

We are asked to calculate the mole fraction of O2.


Molar mass O2 = 32.00 g/mol

Molar mass N2 = 28.02 g/mol


Calculate moles each: 

mol O2 = 0.86 g O2 ×1 mol  O232.00 g O2  = 0.027 mol O2 mol N2 = 0.86 g N2 ×1 mol  N228.02 g N2 = 0.031 mol N2


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Problem Details
A gas mixture contains 1.26 g N2 and 0.86 g O2 in a 1.56-L container at 18 oC.

You want to reference (Pages 216 - 222) Section 5.6 while completing this problem.

Calculate the mole fraction of O2.

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What scientific concept do you need to know in order to solve this problem?

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