Enter the total change in enthalpy (J) and the total number of moles into the calculator to determine the Molar Enthalpy.

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## Molar Enthalpy Formula

The following formula is used to calculate the Molar Enthalpy.

Em = dH / n

- Where Em is the Molar Enthalpy (J/mol)
- dH is the total change in enthalpy (J)
- n is the total number of moles

To calculate molar enthalpy, divide the total change in enthalpy by the number of moles.

## How to Calculate Molar Enthalpy?

The following two example problems outline how to calculate the Molar Enthalpy.

**Example Problem #1:**

- First, determine the total change in enthalpy (J). In this example, the total change in enthalpy (J) is given as 500.
- Next, determine the total number of moles. For this problem, the total number of moles is given as 3.
- Finally, calculate the Molar Enthalpy using the equation above:

Em = dH / n

Inserting the values from above and solving the equation:

Em = 500 / 3 = 166.66 (J/mol)

**Example Problem #2: **

Using the same process as above, first define the variables required by the formula. In this case, these values are provided as the following:

total change in enthalpy (J) = 412

total number of moles = 5

Entering these values gives:

Em = 412 / 5 = 82.4 (J/mol)