We have focused on providing a rigorous treatment of material balances for reacting systems. It is a treatment that will not require revision and upgrading in a subsequent course. Our presentation is based on the two axioms for the mass of multicomponent systems, and it is not limited to single independent reactions. The latter are dominant in the academic world and almost non-existent in the real world where our students must practice their profession.
- However, before attacking the type of problems described in Chapter 1, we wish to consider the special case of single component systems. The study of single component systems will provide an opportunity to focus attention on the concept of control volumes without the complexity associated with multi-component systems. We will examine the accumulation of mass and the flux of mass under relatively simple circumstances, and this provides the foundation necessary for our subsequent studies.
- In the analysis of gas-phase systems it is often important to relate the concentration to the pressure and temperature. This is done by means of an equation of state, often known as a p-V-T relation. In this chapter we will make use of the ideal gas relations; however, many processes operate under conditions such that the ideal gas laws do not apply and one must make use of more general p-V-T relations. Non-ideal gas behavior will be studied in a subsequent course in thermodynamics.