Kp Calculator: Equilibrium Constant from Partial Pressures

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Choose whether to convert from Kc or to compute Kp from individual partial pressures.
The concentration-based equilibrium constant at the given temperature.
Absolute temperature in Kelvin. Must be greater than 0 K.
K
Total stoichiometric moles of gaseous products in the balanced equation (omit solids and liquids).
mol
Total stoichiometric moles of gaseous reactants in the balanced equation (omit solids and liquids).
mol
The pressure unit used. This selects the matching R constant in the Kp = Kc(RT)^(delta-n) formula.
Equilibrium constant (Kp)Favors reactants
0.000038

The dimensionless equilibrium constant expressed in terms of partial pressures.

Change in gas moles (delta-n)-2
RT factor (R x T)24.4531
Kp / Kc ratio0.001672
0.000038 (log scale below)
Strongly favors reactants<0.0001Favors reactants0.0001-0.01Near balance0.01-0.5Favors products0.5+

Kp = 3.796e-5: the equilibrium lies toward the reactant side.

  • The reaction produces relatively little product at equilibrium.
  • Raising temperature (for endothermic reactions) or changing pressure can shift the balance.
  • delta-n = -2: fewer moles of gas are produced than consumed, so Kp is smaller than Kc by the factor (RT)^-2.

Next stepCheck whether temperature changes shift Kp. For an exothermic reaction raising T decreases Kp; for endothermic reactions raising T increases it.

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