For 2NO(g) + O2(g) 2NO2(g), K_c = 1.2x10^3 L mol^-1 at 300 K. Taking R = 0.0821 L atm mol^-1 K^-1, K_p in atm^-1 is approximately

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For $2 NO (g) + O X_{2} (g) 2 NO X_{2} (g)$ , $K_{c} = 1.2 \times 1 0^{3} L mo l^{- 1}$ at 300 K. Taking $R = 0.0821 L atm mo l^{- 1} K^{- 1}$ , $K_{p}$ in $at m^{- 1}$ is approximately

Δ n = 2 - 3 = - 1

, so

K_{p} = K_{c} / (RT)

RT = 0.0821 \times 300 = 24.63

, hence

K_{p} = 1200/24.63 = 48.7 at m^{- 1}