Enter the molar mass (g/mol) and the number of hydroxyl groups into the Equivalent Mass Calculator. The calculator will evaluate and display the Equivalent Mass.

## Equivalent Mass Formula

The following formula is used to calculate the Equivalent Mass.

Meq = MM / HG

• Where Meq is the Equivalent Mass (g/mol/group)
• MM is the molar mass (g/mol)
• HG is the number of hydroxyl groups

## How to Calculate Equivalent Mass?

The following example problems outline how to calculate Equivalent Mass.

Example Problem #1:

1. First, determine the molar mass (g/mol).
• The molar mass (g/mol) is given as: 15.
2. Next, determine the number of hydroxyl groups.
• The number of hydroxyl groups is provided as: 6.
3. Finally, calculate the Equivalent Mass using the equation above:

Meq = MM / HG

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

Meq = 15 / 6 = 2.5 (g/mol/group)

Example Problem #2:

For this problem, the variables needed are provided below:

molar mass (g/mol) = 76

number of hydroxyl groups = 34

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

Meq = MM / HG = ?