Enter the mass of the substance (g) and the total number of moles of substance into the Molar Mass Calculator. The calculator will evaluate and display the Molar Mass. 

Molar Mass Formula

The following formula is used to calculate the Molar Mass. 

MM = m / n
  • Where MM is the Molar Mass (g/mole)
  • m is the mass of the substance (g) 
  • n is the total number of moles of substance 

To calculate the molar mass, divide the mass of the substance by the number of moles of substance.

How to Calculate Molar Mass?

The following example problems outline how to calculate Molar Mass.

Example Problem #1:

  1. First, determine the mass of the substance (g).
    • The mass of the substance (g) is given as: 100.
  2. Next, determine the total number of moles of substance.
    • The total number of moles of substance is provided as: 25.
  3. Finally, calculate the Molar Mass using the equation above: 

MM = m / n

The values given above are inserted into the equation below and the solution is calculated:

MM =100 / 25 = 4.00 (g/mole)

FAQ

What is molar mass and why is it important?
Molar mass is the mass of a given substance (chemical element or chemical compound) divided by the amount of substance, measured in moles. It is expressed in units of grams per mole (g/mol). It’s important because it helps chemists convert between the mass of a substance and the number of moles, facilitating calculations in chemical reactions and equations.

How do you find the number of moles of a substance?
The number of moles of a substance can be found by dividing the mass of the substance by its molar mass. The formula used is n = m / MM, where n is the number of moles, m is the mass of the substance in grams, and MM is the molar mass of the substance in grams per mole.

Can the molar mass calculator be used for all substances?
Yes, the molar mass calculator can be used for any substance as long as you know the mass of the substance and its molar mass. This includes elements, compounds, and mixtures. However, for mixtures, the molar mass of each component must be considered separately.