How much energy is generated from freezing 2.5 g of water?

Jun 25, 2017

$200$ calories.

Explanation:

The (latent) heat of fusion of a material, is either one of:

1) the heat required to melt the material without temperature change or

2) the heat removed from the material to freeze it without temperature change.

For water this latent heat is $80 \text{ cal/g}$. Multiply this by $2.5 \text{ g}$ to get $200 \text{ cal}$.