A gas mixture contains the following gases with the mole fractions indicated: nitrogen (0.21), oxygen (0.16), carbon dioxide (0.23), and sulfur dioxide (0.09). The mixture also contains neon gas. What is the mole fraction of neon

Mole fraction Ar = 0.31

Explanation:

Remember that the sum of the mole fractions in a mixture of gases = 1

Mole fraction = Moles from a gas / Total moles

Mole fraction N₂ + Mole fraction O₂ + Mole fraction SO₂ + Mole fraction CO₂ + Mole fraction Ar = 1

N₂ = 0.21

O₂ = 0.16

CO₂ = 0.23

SO₂ = 0.09

Mole fraction Ar = 1 - 0.21 - 0.16 - 0.23 - 0.09

Mole fraction Ar = 0.31