Enter the molecular weight (g/mol) and the number of moles into the calculator to determine the Energy from Moles. 

Energy from Moles Formula

The following equation is used to calculate the Energy from Moles. 

E = mw*n * c^2 / 1000


  • Where E is the Energy from Moles (Joules)
  • mw is the molecular weight (g/mol) 
  • n is the number of moles 
  • c is the speed of light (299792458 m/s)

How to Calculate Energy from Moles?

The following two example problems outline the steps and information needed in order to calculate the Energy from Moles.

Example Problem #1:

  1. First, determine the molecular weight (g/mol). In this example, the molecular weight (g/mol) is measured to be 13.
  2. Next, determine the number of moles. For this problem, the number of moles is calculated to be 5.
  3. Finally, calculate the Energy from Moles using the formula above: 

E = mw*n * c^2 / 1000

Inserting the values from above and solving the equation with the imputed values gives: 

E = 13*5 * 299792458^2 / 1000 = 5.841908e+15 (Joules)

Example Problem #2: 

Using the same process as example problem 1, we first define the needed variables outlined by the formula. In this case, the values are provide as: 

molecular weight (g/mol) = 40

number of moles = 4

Entering these values into the formula or calculator above gives us: E = 40*4 * 299792458^2 / 1000 = 1.438e+16 (Joules)