Equilibrium constant Kp (partial pressures) (Kp = (Pc)^c(Pd)^d / ((Pa)^a(Pb)^b) for gas-phase reaction)

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Kp = (Pc)^c(Pd)^d / ((Pa)^a(Pb)^b) for gas-phase reaction

What each symbol means

SymbolWhat it stands for
K_pEquilibrium constant in pressure terms (units depend on Δn_gas)
P_XEquilibrium partial pressure of gas X (same units throughout, often atm or bar)

When to use this

Ideal gas mixture at constant T. Only gaseous species appear. Solids/liquids omitted.