Using Equilibrium Constants in Calculations

We can also use the equilibrium constant to calculate the equilibrium concentration of one of the reactants or products, given the equilibrium concentrations of the others. For example, consider the reaction  

In an equilibrium mixture, the concentration of COF2 is 0.255 M and the concentration of CF4 is 0.118 M. What is the equilibrium concentration of CO2 We begin by sorting the information in the problem statement. 

We then draw a solution map showing how the expression for the equilibrium constant provides the equation that gets us from the given quantities to the quantity we are trying to find. 

We wrife fhe equilibrium expression for the reaction, and then we solve it for the quanhty we are trying to find ([CO2]). 

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