Express the equilibrium constant for the combustion of propane in the balanced chemical equation c3h8 (g) + 5o2 (g) ?3co2 (g) + 4h2o (g)

According to the balanced equation:

C3H8 (g) + 5O2 (g) ↔ 3CO2 (g) + 4 H2O (g)

aA + bB ↔ cC + dD

according to K formula when:

K = concentration of the products / concentration of the reactants

K = [C]^c[D]^d / [A]^a[B]^b

when [A],[B],[C]and[D] is the concentrations

and a, b, c and d is the no of moles

∴ K = [CO2]^3[H2O]^4 / [C3H8] [ O2]^5