The unit of K_c for the reaction N2O4(g) 2NO2(g), with concentrations in mol L^-1, is

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The unit of $K_{c}$ for the reaction $N X_{2} O X_{4} (g) 2 NO X_{2} (g)$ , with concentrations in $mol L^{- 1}$ , is

The unit of

K_{c}

(mol L^{- 1})^{Δ n}

. Here

Δ n = 2 - 1 = + 1

, so the unit is

mol L^{- 1}