In this method, the problem is reduced to a single unknown at the outset, rather than at the end as in the element ratio method described above. The alternative method is illustrated with the gas phase reaction:
Example: The temperature is 2000 and the total pressure is lA atm. The initial mixture is stoichiometric, which means consisting of the ratio of reactants that would produce pure product if completely reacted.
The standard enthalpy and entropy changes of this reaction are AH° = -564 kJ/mole and AS° = - 174 J/mole-K (note that the entropy rule of thumb given at the end of Sect. 9.5 is satisfied for this reaction). At 2000 K, the equilibrium constant from Eq (9.20) is:
The mass action law in terms of mole fractions is:
Was this article helpful?
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.