The equilibrium constant is given by the ratio between the products and the reactants, where their stoichiometric numbers are exponents.
[tex]K=\frac{\lbrack H_2O\rbrack^2^{}^{}}{\lbrack H_2\rbrack^2\lbrack O_2\rbrack}[/tex]Observe that the molecule H2O must have a coefficient of 2 in order to balance the equation.
• [H2O] is the equilibrium concentration of the product (water).
,• [H2} is the equilibrium concentration of the hydrogen molecule.
,• [O2] is the equilibrium concentration of the oxygen molecule.
