equilibrium constant

• What is Kp used for?


  Kp is the equilibrium constant used for gaseous equilibria.
• What is required for Kp to be calculated?


  All reactants and products must be in a gaseous state.
• What is the definition of partial pressure?


  Partial pressure is the pressure exerted by a single gas in a mixture of gases.
• How is the partial pressure of a substance found?


  It is found using the molar fraction of that substance and the total pressure.
• How is the partial pressure of A represented?


  The partial pressure of A is shown as (pA).
• If the total moles in a system are 1.31, what is the molar fraction of H2 if it has 0.28 moles?


  The molar fraction of H2 is $0.21$.
• What is the partial pressure of H2 if its molar fraction is 0.21 and the total pressure is 2.35 atm?


  The partial pressure of H2 is $0.50 \text{ atm}$.
• In what units are partial pressures commonly measured?


  Partial pressures are commonly measured in Pascals.
• How is Kp calculated for a gaseous equilibrium?


  Kp is equal to the product of the partial pressures of products over the partial pressures of reactants.
• How does the variation in moles affect Kp?


  Any variation in moles raises the partial pressure to a power equal to the number of moles.
• What is the relationship between Kp and Kc?


  • Kp is similar to Kc.
  • Kp is used for gaseous equilibria.
  • Kc is used for equilibria in solutions.