Do pure solids and liquids contribute to the Δn calculation?

No. Only species in the gaseous phase (g) are included in the summation of product and reactant stoichiometric coefficients for Δn.

Kc to Kp EquilibriumChemistry

Equilibrium Constant Kc to Kp Gas Conversion Calculator

Convert between molar concentration equilibrium constant (Kc) and partial pressure constant (Kp) for gaseous reactions across any thermodynamic temperature.

Chemistry & Solutions Chemical Equilibrium Thermodynamics

Calculated Result

Partial Pressure Equilibrium Constant (Kp)

Calculator Inputs

Concentration Equilibrium Constant (Kc)

Quick select:

Reaction Temperature

Quick select:

Sum of Gaseous Products Moles

mol

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Sum of Gaseous Reactants Moles

mol

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Partial Pressure Equilibrium Constant (Kp)

Gaseous Moles Change (Δn)

1 mol

Conversion Multiplier (RT)^Δn

0 -

Kc vs Kp Equilibrium Constant Comparison

Constant Kc

0.04 -(100%)

Resulting Kp

0 -(0%)

Standard physical chemistry tool for homogeneous and heterogeneous gas phase equilibrium conversions.

Calculation Methodology

Thermodynamic Relationship: Kp = Kc * (R * T)^(Δn). Where R = 0.08206 L atm / (mol K), T is in Kelvin (K = °C + 273.15), and Δn = moles of gaseous products - moles of gaseous reactants. When Δn = 0, Kp strictly equals Kc.

Frequently Asked Questions

When the stoichiometric change in moles of gas is zero (Δn = 0). Since any number raised to the power of zero equals 1, the (RT)^Δn factor becomes unity and Kp = Kc.