Molar Mass of Gas Calculator

Molar Mass of Gas Calculator

The Molar Mass of Gas Calculator uses the ideal gas law to find molar mass, moles, pressure, volume, temperature, or mass of a gas sample. It is useful in stoichiometry, gas analysis, and laboratory calculations.

$$PV = nRT$$

$$M = \frac{m}{n} = \frac{m \cdot RT}{PV}$$

where $P$ is pressure, $V$ is volume, $n$ is moles, $R = 0.082057$ L·atm/(mol·K), $T$ is temperature in kelvin, $m$ is mass in grams, and $M$ is molar mass in g/mol.

Example: 32 g of gas at 1 atm, 273.15 K, and 22.4 L gives $n = PV/(RT) = 1$ mol, so $M = 32$ g/mol (oxygen gas, O₂).

Related tools: Molar Mass Calculator, Kp Calculator, and Grams to Moles Calculator.