# Molar Mass of Gas Calculator

The mass (in atomic mass units) of one mole of a substance is Molar mass. One atomic mass unit (u) is equal to 1/12 the mass of one atom of carbon-12. To calculate Molar mass of a gas just enter the values of the volume of gas, the mass of gas, the temperature and pressure of a gas in the molar mass of gas calculator. The molecular weight of a molecule is the total number of protons and neutrons in all the atoms in that molecule. Molar mass of any gas can be obtained using ideal gas law.

### Example:

A certain reaction occurs, producing an oxide of nitrogen as a gas. The gas has a mass of 1.211 g and occupies a volume of 677 mL. The temperature in the laboratory is 23°C and the air pressure is 0.987 atm.

Calculate the molar mass of the gas?

#### Solution:

Molar Mass of Gas = ( 677 * 0.0821 * ( 0.987 / 23 ) * 1.211 )

= 2.9 g/mol .