Themes > Science > Chemistry > Inorganic Chemistry > Equilibrium > Equilibrium Constant

To determine the amount of each compound that will be present at equilibrium you must know the equilibrium constant. To determine the equilibrium constant you must consider the generic equation:

aA + bB <--> cC + dD
 

The upper case letters are the molar concentrations of the reactants and products. The lower case letters are the coefficients that balance the equation. Use the following equation to determine the equilibrium constant (Kc).

Kc equation

For example, determining the equilibrium constant of the following equation can be accomplished by using the Kc equation.

Using the following equation, calculate the equilibrium constant.

N2(g) + 3H2(g) <--> 2NH3(g)

A one-liter vessel contains 1.60 moles NH3, .800 moles N2, and 1.20 moles of H2. What is the equilibrium constant?

example equilibrium constant

Answer: 1.85


Information provided by: http://library.thinkquest.org