Molar Mass of Gas

on . Posted in Classical Mechanics

Molar mass of a gas is the mass of one mole of that gas. It is typically expressed in units of grams per mole (g/mol) and is calculated by adding up the atomic masses of all the atoms in the chemical formula of the gas.

For example, if you want to find the molar mass of oxygen gas (O2), you would add up the atomic masses of two oxygen atoms.  The atomic mass of oxygen is approximately 16.00 atomic mass units (amu), so the molar mass of O2 is approximately 32.00 g/mol.

The molar mass of a gas is an important parameter in chemistry, as it is used in various calculations, including stoichiometry, the ideal gas law, and the determination of gas densities.


Molar Mass of Gas formula

\( M \;=\; V \: 0.0821 \; ( G \;/\; T ) \; p  \)
Symbol English Metric
\( M \) = molar mass of gas \(lbm\;/\;mol\)  \(kg\;/\;mol\) 
\( V \) = volume \( in^3 \) \( mm^3 \)
\( G \) = mass of gas \(lbm\;/\;mol\) \(kg\;/\;mol\)
\( T \) = temperature \( F \) \( C \)
\( p \) = pressure (psi) \(lbf\;/\;in^2\) \( Pa \)


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Tags: Mass Gas