Mass to Molar Basis Conversion for Liquids, Gases, Solids
The conversion between mass and molar basis requires the molecular weight. To do this conversion the data reference uses the following equation:
Where:
xi = the mass fraction of component i
yi = the molar fraction of component i
MWi = the molecular weight of component i
Note: Molar and volume fractions of gases are considered identical. Both fractions are exactly the same for ideal gases.
EXAMPLE: Mass to Molar Basis Conversion for Liquids, Gases and Solids
A liquid stream consists of a mixture of three components: A, B, and C. The molar fraction is calculated using the equation shown above.
Mass to Molar Basis Conversion for Liquids, Gases, and Solids Example
| Component | Mass Fraction | Molecular Weight (lb/lbmol) | Molar Fraction |
|---|---|---|---|
| A | 0.2 | 20 | 0.188 |
| B | 0.75 | 18 | 0.785 |
| C | 0.05 | 35 | 0.027 |
| Total | 1 | 1 |