Reaction 03 ← →
The Equilibrium Constant (Keq)
Low of Chemical Equilibrium states that "at equilibrium, there is a constant ratio between the concentrations of the products and reactants in any change"
The equilibrium Constant:
- the ratio of the concentrations of products over the concentrations of reactants
- all concentration terms are raised to the power of the coefficiants when we write this as an equation.
In general;
* for a given system at equilibrium, the value ofLeq depends only on temperature (remember activation energy)
Example: A mistore of nitrogen and cholorine guses was kept at a certain temp. in 05. or flast.
N2(g) + 3Cl2(g) 2NCl3(g)
When analyzed, it was found to contain 0.007 mol of N2(g), 0.0022mol of Cl2(g), and 0.95 mol of NCl3(g). Calculate Keq.
Interpreting Keq:
- A large Keq means that the concentration of products is lager than the conc. of reactants at equilibrium. Therefore the rxn fauois products.
- A small keq means the opposite!
* If K > 1 products are fovored
* If K < 1 reactants are favored
* If K = 1 there are apprirunately equal conc. of reactants and products.
RATE OF REACTION
If at a certain temperture ezactly 1 mole of CO2 and exactly 1 mole of H2 are mixed in a one litre containers, the equilibrium contant is .803.
For the following gaseous reaction, what are the equilibrium concentration of all species?
If [CO2] = 1, [H2] = 1, [CO] = 0, [H2O] = 0
at equilibrium let [CO] and [H2O] = X then [CO2] and [H2] must be 1-X.
← →