The heat of fusion for water is 80.cal/g.How many calories of heat are released when 20.0 g of water at is frozen to ice?

Question

The heat of fusion for water is 80.cal/g.How many calories of heat are released when 20.0 g of water at  is frozen to ice?

Quizplus · Accepted Answer

The heat of fusion for water is the amount of heat energy required to convert 1 gram of water from liquid to solid state at the same temperature. Therefore, the amount of heat energy released during the freezing of water from liquid to solid state is equal to the amount of heat energy required to convert it from solid to liquid state, which is 80. cal/g. 
So, the total amount of heat energy released when 20.0 g of water is frozen to ice is:
20.0 g x 80. cal/g = 1600 cal
Hence, the correct answer is B.

The Heat of Fusion for Water Is 80