The unit of K_p for the reaction 2SO2(g) + O2(g) 2SO3(g), when pressures are in atm, is

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The unit of $K_{p}$ for the reaction $2 SO X_{2} (g) + O X_{2} (g) 2 SO X_{3} (g)$ , when pressures are in atm, is

The unit of

K_{p}

atm^{Δ n}

. Here

Δ n = 2 - 3 = - 1

, so the unit is

at m^{- 1}