What is the mole fraction of oxygen in a gas mixture that is 27% oxygen and 73% nitrogen by volume?
A)0.24
B)0.27
C)0.32
D)0.37

Question

Quizplus · Accepted Answer

The mole fraction of a component in a mixture is the ratio of the number of moles of that component to the total number of moles of all components in the mixture. For gases at the same temperature and pressure, the mole fraction is equal to the volume fraction because of Avogadro's law. Therefore, if the gas mixture is 27% oxygen by volume, the mole fraction of oxygen is also 0.27.

What Is the Mole Fraction of Oxygen in a Gas