Molecular Weight

Written by Jerry Ratzlaff on . Posted in Thermodynamics

Molecular weight, abbreviated as MW, also called molecular mass, refers to the average mass of one molecule of a substance, 1⁄12 (0.083) the mass of carbon 12 atom.

 

Molecular weight formula

\(\large{ MW = \frac{ R^* }{ R   } }\) 

Where:

 Units English Metric
\(\large{ MW }\) = molecular weight \(\large{\frac{lbm}{lbmol}}\)   \(\large{\frac{kg}{kmol}}\)  
\(\large{ R }\) = specific gas constant \(\large{\frac{ft-lbf}{lbm-R}}\)  \(\large{\frac{J}{kg-K}}\) 
\(\large{ R^* }\) = universal gas constant \(\large{ \frac{lbf-ft}{lbmol-R} }\) \(\large{ \frac{J}{kmol-K} }\)

 

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Tags: Equations for Weight