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Essentials of Chemical Reaction Engineering by H. Scott Fogler

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4.2.3 Gas Phase Concentrations

In our previous discussions, we considered primarily systems in which the reaction volume or volumetric flow rate did not vary as the reaction progressed. Most batch and liquid-phase and some gas-phase systems fall into this category. There are other systems, though, in which either V or υ do vary, and these will now be considered.

A situation where one encounters a varying flow rate occurs quite frequently in gas-phase reactions that do not have an equal number of product and reactant moles. For example, in the synthesis of ammonia,

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4 mol of reactants gives 2 mol of product. In flow systems where this type of reaction ...

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