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28 April, 20:05

A particular sample of air contains 3 mol N2 (nitrogen gas),

7 mol O2 (oxygen gas), and 2 mol Ar (argon gas).

What is the mole fraction of oxygen gas in this sample of air?

Question 5 options:

0.20

0.58

0.17

0.42

+3
Answers (1)
  1. 28 April, 20:10
    0
    Mol fraction O2 = 0.583 (option 2) is correct

    Explanation:

    Step 1: Data given

    Number of moles N2 (nitrogen gas) = 3.0 moles

    Number of moles O2 (oxygen gas) = 7.0 mol

    Number of moles Ar (Argon gas) = 2.0 moles

    Step 2: Calculate the total number of moles

    Total number of moles = moles of N2 + moles of O2 + moles of Ar

    Total number of moles = 3.0 moles + 7.0 moles + 2.0 moles

    Total number of moles = 12.0 moles

    Step 3: Calculate mole fractions

    mol fraction = Number of moles / total number of moles

    Mol fraction N2 = 3.0 / 12.0 moles = 0.250

    Mol fraction O2 = 7.0 / 12.0 moles = 0.583

    Mol fraction Ar = 2.0 / 12.0 moles = 0.167

    Mol fraction = 0.250 + 0.583 + 0.167 = 1
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