Molar to Mass 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: Molar to Mass Basis Conversion for Liquids, Gases, Solids

A liquid stream consists of a mixture of three components: A, B, and C. The mass fraction is calculated using the equation shown above.

Molar to Mass Basis Conversion for Liquids, Gases, and Solids Example

Component	Molar Fraction	Molecular Weight (lb/lbmol)	Mass Fraction
A	0.188	20	0.200
B	0.785	18	0.750
C	0.027	35	0.050