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Equilibrium Constant for Partial Pressures (Kp) Calculator

Calculate equilibrium constant for gases (Kp) from partial pressures or convert between Kc and Kp.

Input Parameters

Instant Real-time Calculation

Concentration Constant (Kc)

Change in Gas Moles (Δn = Moles Prod - Moles React)

Temperature (Kelvin)

Result Chemistry

Pressure Equilibrium Constant (Kp)

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Calculation Logic:

Relates gaseous equilibrium constants Kp and Kc using the ideal gas constant R = 0.08206 L·atm/(mol·K). If Δn = 0, then Kp = Kc.

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Understanding Equilibrium Constant for Partial Pressures (Kp) Calculator & Formula

Mathematical Formula: Kp = Kc × (R × T)^Δn; Δn = (Moles Gas Products - Moles Gas Reactants)

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Kp vs Kc Relationship in Gaseous Reactions

Reaction	Δn (Gas Moles)	Relationship	Does Kp = Kc?
H2(g) + I2(g) ⇌ 2 HI(g)	2 - 2 = 0	Kp = Kc	Yes (Δn = 0)
N2(g) + 3 H2(g) ⇌ 2 NH3(g)	2 - 4 = -2	Kp = Kc × (RT)⁻²	No (Kp < Kc at 298K)
PCl5(g) ⇌ PCl3(g) + Cl2(g)	2 - 1 = +1	Kp = Kc × (RT)¹	No (Kp > Kc at 298K)

How to Use the Equilibrium Constant for Partial Pressures (Kp) Calculator

1 Input the concentration equilibrium constant Kc.
2 Enter change in gaseous stoichiometric moles Δn (moles gas products minus reactants).
3 Input temperature in Kelvin.
4 Obtain pressure equilibrium constant Kp.

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