Question

The equilibrium constant for the gas phase reaction

N2 (g) + O2 (g) ↔ 2NO (g)

is Keq = 4.20 × 10-31 at 30 °C. At equilibrium, __________.



A only reactants are present

B roughly equal amounts of products and reactants are present

C reactants predominate

D only products are present

E products predominate

Answer 1

only reactants are present

If equllibrium constant is greater than 10^3 then product predominates

If equllibrium constant is greater than 10^ -3 then reactant predominates

in between 10^3 and 10^-3 the reaction is in equllibrium

and we see that the above value is 10^-31, it is very small so the answer is reactants are presents