Enter the Kc, gas constant, temperature, and change in moles into the calculator to determine the Kp.

Kc To Kp Formula

The following formula is used to calculate the conversion from Kc (equilibrium constant in terms of concentration) to Kp (equilibrium constant in terms of pressure).

Kp = Kc * (RT)^Δn

Variables:

  • Kp is the equilibrium constant in terms of pressure
  • Kc is the equilibrium constant in terms of concentration
  • R is the ideal gas constant (0.0821 L·atm/(K·mol) or 8.314 J/(K·mol) depending on the units used)
  • T is the temperature in Kelvin (K)
  • Δn is the change in moles of gas in the reaction (calculated as moles of gaseous products – moles of gaseous reactants)

To calculate Kp from Kc, multiply Kc by the product of the ideal gas constant (R) and the temperature (T), all raised to the power of the change in moles of gas in the reaction (Δn).

What is a Kc To Kp?

Kc to Kp refers to the conversion from the equilibrium constant in terms of concentration (Kc) to the equilibrium constant in terms of pressure (Kp) in the context of chemical reactions. This conversion is necessary because some reactions are better described by the pressure of the reactants and products, while others are better described by their concentrations. The relationship between Kc and Kp is given by the equation Kp = Kc(RT)^(Δn), where R is the ideal gas constant, T is the temperature in Kelvin, and Δn is the change in moles of gas in the reaction.

How to Calculate Kc To Kp?

The following steps outline how to calculate the equilibrium constant in terms of pressure (Kp) using the formula: Kp = Kc * (RT)^Δn.

  1. First, determine the equilibrium constant in terms of concentration (Kc).
  2. Next, determine the ideal gas constant (R).
  3. Next, determine the temperature in Kelvin (T).
  4. Next, determine the change in moles of gas in the reaction (Δn).
  5. Finally, calculate the equilibrium constant in terms of pressure (Kp) using the formula Kp = Kc * (RT)^Δn.
  6. After inserting the variables and calculating the result, check your answer with the calculator above.

Example Problem:

Use the following variables as an example problem to test your knowledge.

Equilibrium constant in terms of concentration (Kc) = 0.5

Ideal gas constant (R) = 0.0821 L·atm/(mol·K)

Temperature in Kelvin (T) = 300 K

Change in moles of gas in the reaction (Δn) = 2