Mass Fraction and Molar Fraction

Convert the mass fraction and mole fraction of a substance in a mixture. The mass fraction indicates the proportion of the mass of the particles of a particular substance in a mixture of different substances. Particles here mean atoms or molecules. Proportion of mass means something like this: If 10 grams of the substance are contained in 100 grams of total mass, then the mass fraction is 10 percent. The mole fraction, on the other hand, is the proportion of the number of particles to the total number, regardless of their mass. For 10 particles of the substance out of 100 particles, the mole fraction would be 10 percent. Since obviously not all particles have the same mass, the mass fraction and mole fraction are different. However, both proportions can be converted into one another if the molar mass of the substance and the average molar mass of the remainder are known.
You can enter the chemical formula of a molecule or element and transfer the corresponding molar mass of the substance into the input field for the substance whose proportion you want to know or into the field for the remainder of the mixture. Or you can enter the two molar masses directly. Then you enter one of the four values ​​for mass fraction and molar fraction to calculate the other three values. Mass and molar fractions are displayed as percentages.

Example: Oxygen (enter O2 as molecular formula) has an average mass fraction of 20.9 percent in air. Its molar mass is used as the fraction, 31.999. The remainder of the air consists of 78.1 percent nitrogen (N2, molar mass 28.013) and 1 percent argon (Ar, molar mass 39.948), the other parts have been omitted for simplicity. The molar mass of the remainder is the weighted average of the molar masses of nitrogen and argon, which is 28.164. These values ​​result in a mole fraction of oxygen in the air of 23.089 percent.