Phase Change Calculations

How much energy is produced when a substance changes phase? This is a question that chemists are asked more and more, as solutions to energy-related problems are investigated. How much energy can be generated from the burning of fossil fuels? How much energy can be generated from steam? It is possible for chemists to estimate this information using some simple calculations. In this topic, you will learn how to complete phase change calculations using the molar heat of fusion and molar heat of vaporization.

Essential Question

• How are the molar heat of fusion and the molar heat of vaporization used in calculations?