Simultaneous Gas Phase Reactions

When more than one chemical reaction achieves equilibrium, a mass action law must be written for each. The analytical tool of choice is the reaction progress variable method.

Example: Dissociation of water vapor.

At low temperatures, water vapor (steam) does not dissociate, and chemical reactions can be neglected. At high temperature (> ~ 1500 K), dissociation into H2 and O2 becomes significant; at very high temperatures, as might occur in the exhaust of a rocket, the hydroxyl radical, OH, appears. The equilibrium reactions governing the concentrations of the four species are:

Assuming the total pressure to be 1 atm, the mass-action expressions for the above equilibria are:

Was this article helpful?

0 0
Solar Panel Basics

Solar Panel Basics

Global warming is a huge problem which will significantly affect every country in the world. Many people all over the world are trying to do whatever they can to help combat the effects of global warming. One of the ways that people can fight global warming is to reduce their dependence on non-renewable energy sources like oil and petroleum based products.

Get My Free Ebook


Post a comment