Enter the mass of substance that was change to a liquid state and the total heat required to determine the heat of fusion.

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## Heat of Fusion Formula

The following formula is used to calculate a heat of fusion.

H_{f} = q / m

- Where H
_{f}is the heat of fusion (J/g) - q is the total heat required to melt the solid (J)
- m is the total mass of the material that was melted (g)

## Heat of Fusion Definition

A heat of fusion is defined as the total energy per unit mass required in order to turn a solid into a liquid of a given material.

## Heat of Fusion Example

How to calculate heat of fusion?

**First, determine the total mass of solid that was melted.**For this example the mass of the solid was determined to be 50g.

**Next, determine the total heat required to melt the solid.**After an experiment to melt the solid, it’s determined that the total heat added to the solid was 4000J.

**Finally, calculate the heat of fusion.**Using the formula we find the heat of fusion to be 4000J/50g = 80J/g.

## FAQ

**What is heat of fusion?**

Heat of fusion is a measure of the amount of energy per unit mass that is required to melt a solid and turn it into a liquid.