Enter the change in enthalpy (J), the molar mass (g/mol), and the number of moles into the calculator to determine the Specific Enthalpy. 

Specific Enthalpy Formula

The following formula is used to calculate the Specific Enthalpy.

Esp = dH / (mm*N)

  • Where Esp is the Specific Enthalpy (J/g)
  • dH is the change in enthalpy (J) 
  • mm is the molar mass (g/mol) 
  • N is the number of moles 

How to Calculate Specific Enthalpy?

The following example problems outline how to calculate the Specific Enthalpy.

Example Problem #1

  1. First, determine the change in enthalpy (J). In this example, the change in enthalpy (J) is given as 100 .
  2. Next, determine the molar mass (g/mol). For this problem, the molar mass (g/mol) is given as  5 .
  3. Next, determine the number of moles. In this case, the number of moles is found to be 3.
  4. Finally, calculate the Specific Enthalpy using the formula above: 

Esp = dH / (mm*N)

Inserting the values from above yields: 

Esp = 100 / (5*3) = 6.66 (J/g)


Example Problem #2

Using the same method as above, determine the variables required by the equation. For this example problem, these are as follows:

change in enthalpy (J) = 600

molar mass (g/mol) = 6

number of moles = 8

Entering these given values and solving gives: 

Esp = 600 / (6*8) = 12.5 (J/g)