Enter the number of moles, the density (kg/m^3), and the volume (m^3) into the Molar Mass From Density Calculator. The calculator will evaluate and display the Molar Mass From Density. 

Molar Mass From Density Formula

The following formula is used to calculate the Molar Mass From Density. 

MM = (D*V * 1000) / n
  • Where MM is the Molar Mass From Density (g/mole)
  • n is the number of moles 
  • D is the density (kg/m^3) 
  • V is the volume (m^3) 

To calculate the molar mass from density, multiply the density by the volume, then multiply by 1000 and divide by the number of moles.

How to Calculate Molar Mass From Density?

The following example problems outline how to calculate Molar Mass From Density.

Example Problem #1

  1. First, determine the number of moles.
    • The number of moles is calculated to be : 4.5.
  2. Next, determine the density (kg/m^3).
    • The density (kg/m^3) is measured to be: 30.
  3. Next, determine the volume (m^3).
    • The volume (m^3) is found to be: 300.
  4. Finally, calculate the Molar Mass From Density using the formula above: 

MM = (D*V * 1000) / n

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

MM = (4.5*30 * 1000) / 300 = 450 (g/mole)

Example Problem #2

The variables needed for this problem are provided below:

number of moles = 6

density (kg/m^3) = 7

volume (m^3) = 4

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

MM = (D*V / 1000) / n = (g/mole)