Volume to Molar Basis Conversion for Liquids and Solids
Volume to molar basis conversions are not commonly used. They are included for any special Cases that might need them. The conversion is calculated in two steps since there is not a simple formula that relates both bases. The following equations are used.
| Volume to mass basis:Mass to molar basis: | Volume to mass basis: | Mass to molar basis: |
|---|---|---|
| Volume to mass basis: | Mass to molar basis: | |
Where:
xi = the mass fraction of component i
vi = the volume fraction of component i
yi = the molar fraction of component i
MWi = the molecular weight of component i
SGi = the specific gravity of component i
EXAMPLE: Volume to Molar Basis Conversion for Liquids and Solids
A liquid stream consists of a mixture of three components: A, B, and C. The molar fraction is calculated using the equations shown above.
Volume to Molar Basis Conversion for Liquids and Solids Example
| Component | Volume Fraction | Apparent Density (SG) | Molecular Weight (lb/lbmol) | Molar Fraction |
|---|---|---|---|---|
| A | 0.194 | 0.9 | 20 | 0.2 |
| B | 0.737 | 0.8 | 18 | 0.75 |
| C | 0.069 | 1.1 | 35 | 0.05 |