The equilibrium constant

• What is Kp used for in chemistry?

  Kp is used for gaseous equilibria

  
• What must be true for Kp to be calculated?

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

  Pressure of an individual gas in a mixture
• How is the partial pressure of a substance calculated?

  Using molar fraction and total pressure

  
• How is the partial pressure of A represented?

  As (pA)

  
• If total moles in a system are 1.31, what is the molar fraction of H2 if its moles are 0.28?

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

  0.50 atm
• In what units are partial pressures commonly measured?

  Pascals or atmospheres
• How is Kp calculated for a gaseous equilibrium?

  Product of partial pressures of products over reactants
• How does Kp relate to moles in a reaction?

  Variation in moles raises partial pressure to a power