Molar Mass of Gas Calculator

Enter value and click on calculate. Result will be displayed.
Volume of gas (V) :
cm3
Mass of gas (M) :
g
Temperature (T) :
Celcius
Pressure of gas (P) :
am
Result:
Molar mass of gas :

A Molar Mass of Gas Calculator is a tool used to calculate the molar mass (or molecular weight) of a gas. The molar mass is the mass of one mole of gas molecules and is expressed in grams per mole (g/mol).

Why use a Molar Mass of Gas Calculator?

The molar mass of a gas is an important value in chemistry because it allows you to convert between the mass of a gas and the number of moles. Understanding the molar mass helps in determining the amount of substance present in a sample, and is essential for stoichiometric calculations, gas laws, and chemical reactions involving gases.

How does a Molar Mass of Gas Calculator work?

The molar mass of a gas can be calculated using the Ideal Gas Law or by knowing the composition of the gas:

  1. Using the Ideal Gas Law: The Ideal Gas Law states that:

    PV=nRT

    Where:

    • P is pressure,
    • V is volume,
    • n is the number of moles,
    • R is the gas constant,
    • T is temperature (in Kelvin).

    Rearranging this equation to solve for molar mass (M):

    Where:

    • m is the mass of the gas,
    • n is the number of moles.

  2. Using Composition: For a mixture or a compound gas, you can calculate the molar mass by summing the atomic masses of the elements present based on their molecular formula. For example, for CO2​ , the molar mass would be the sum of the atomic masses of carbon (12.01 g/mol) and two oxygen atoms (2 × 16.00 g/mol).

The calculator will either use the ideal gas law or the molecular formula to compute the molar mass of the gas.

When to use a Molar Mass of Gas Calculator?

  • Chemistry experiments: When you're dealing with gases and need to know the molar mass for conversions or chemical reactions.
  • Stoichiometry: To determine how much of a gas is involved in a reaction, or how much of a substance you’ll need for a reaction involving gases.
  • Gas law calculations: For determining the behavior of gases (like pressure, volume, or temperature) in relation to each other.
  • Determining unknown gases: If you know the conditions (pressure, volume, and temperature) of a gas, you can calculate its molar mass and identify it.