Relating Chemical Equation Stoichiometry and Equilibrium Constants

Relating Chemical Equation Stoichiometry and Equilibrium Constants 

There are many ways to write a balanced chemical equation for a given reaction. For example, if we multiply Equation 15.1, N204(g) 2 N02(g) by 2, we have 

This chemical equation is balanced and might be written this way in some contexts. Therefore, the equilibrium-constant expression for this equation is 

It is also possible to calculate the equilibrium constant for a reaction if we know the equilibrium constants for other reactions that add up to give us the one we want, similar to Hess s law. (Section 5.6) Eor example, consider the following two reactions, their equilibrium-constant expressions, and their equilibrium constants at 100 °C  

You can prove algebraically that the equilibrium-constant expression for reaction 3 is the product of the expressions for reactions 1 and 2  

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