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 

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)

Example Problem #2: 

For this problem, the variables needed are provided below:

mass of the substance (g) = 60

total number of moles of substance = 302

This example problem is a test of your knowledge on the subject. Use the calculator above to check your answer. 

MM = m / n = ?