How much energy is released when 100.0 grams of water are frozen?

Expert Answers

An illustration of the letter 'A' in a speech bubbles

Freezing refers to the phase change from liquid to solid phase.

In this case, we are discussing the freezing of water. Water freezes at 0 degrees Celsius. Since no other information is given, let us assume that the water is already at 0 degrees Celsius and is going to freeze.

The amount of heat released when the water freezes is also known as the latent heat of fusion and is equal to 80 calories per gram of water or, 334 Joules per gram of water.

Here we have 100 grams of water.

Thus, the amount of heat released on freezing = mass of water x latent heat of fusion.

= 100 g x 334 J/g = 33,400 J = 33.4 kJ 

Thus, 33.4 kilojoules of energy is released when 100 g of water freezes. 

Hope this helps. 

See eNotes Ad-Free

Start your 48-hour free trial to get access to more than 30,000 additional guides and more than 350,000 Homework Help questions answered by our experts.

Get 48 Hours Free Access
Approved by eNotes Editorial