Interactive Self-Study Module: Heats of Reaction
Overview:
This module uses screencasts and simulations to explain how heats of reaction are determined from heats of formation, and how heats of reaction at elevated temperatures are calculated using temperature-dependent heat capacities. Your retention of material in this module will increase if you write down reasons for your answers to ConcepTests, questions in screencasts, and questions to answer before using the interactive simulation, and you try to solve the example problems before watching the screencast solutions. We suggest using the learning resources in the following order:
- Attempt to answer the multiple choice ConcepTest and solve the example problem before watching the screencasts or working with the simulations.
- Watch the screencasts and answer the questions within the screencasts.
- Review important equations for heats of reaction.
- Use the interactive simulation to better understand how heats of reaction change with temperature.
- Try to solve the example problems before watching the solutions in the screencasts.
- Answer the ConcepTests.
- Look at the list of key points, but only after you try to list the key points yourself.
Motivation:
- Heats of reaction are important for chemical reactor design and for determining heat removal or addition.
- This module is intended for a material and energy balances course and a thermodynamics course.
Before studying this module, you should be able to:
- Apply the concept of state functions.
- Calculate enthalpy changes using temperature-dependent heat capacities.
After studying this module, you should be able to:
- Calculate a heat of reaction at standard conditions from heats of formation.
- Given heat of reaction at 298 K, use temperature-dependent heat capacities to calculate heat of reaction at other temperatures.
- Use Hess’s law to calculate a heat of reaction.
- Use heats of combustion to calculate a heat of reaction.