At equilibrium, the concentration of

$$\begin{gathered} \mathrm{N}_2=3.0 \times 10^{-3} \mathrm{M} \\ \mathrm{O}_2=4.2 \times 10^{-3} \mathrm{M} \\ \text{and} \quad \mathrm{NO}=2.8 \times 10^{-3} \mathrm{M} \end{gathered}$$

in a sealed vessel at $$800 \mathrm{~K}$$ and $$1 \mathrm{~atm}$$ pressure. What will be $$K_p$$ for the given reaction?

$$\mathrm{N}_2(g)+\mathrm{O}_2(g) \rightleftharpoons 2 \mathrm{NO}(g)$$

Assertion (A) $$K_p$$ can be equal to or less than or even greater than the value of $$K_C$$.

Reason (R) $$K_p=K_C(R T)^{\Delta n}$$

Relation between $$K_p$$ and $$K_C$$ depends on the change in the number of moles of gaseous reactants and products.