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 

To calculate the specific enthalpy, divide the change in enthalpy by the product of the molar mass and 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)