Given the unbalanced equation: C3H8(g) + O2(g) → H2O(g) + CO2(g)When the equation is completely balanced using smallest whole numbers, the coefficient of O2 is ? need help with this !

Consider the reaction: n2(g) + o2(g) ⇄ 2no(g) kc = 0.10 at 2000oc starting with initial concentrations of 0.040 mol/l of n2 and 0.040 mol/l of o2, calculate the equilibrium concentration of no in mol/l how would this be done?