Equilibrium 2 Flashcards
For equations involving pressure, equilibrium constant can be expressed in terms of what as well as concentration?
Pressure
What is partial pressure?
The pressure a gas in a mixture would exert if it alone occupied the volume of the mixture
How can the partial pressure of a gas be calculated?
p(x) =( n(x) / n(total)) x Ptotal
What is the only variable that can affect the value of an equilibrium constant?
Temperature
Why does changing concentration of a reactant or product not have an effect on the equilibrium constant?
Changing the concentration of one or more reactants or products means that the reaction would no longer be in an equilibrium state, so no equilibrium means there would be no equilibrium constant
What is dynamic equilibrium?
When the forward and backwards reactions are happening at the same rate, so the concentrations of reactants and products stays constant
How are moles at equilibrium calculated?
Reactants: initial moles - moles reacted
Products: initial moles + moles formed
How can total pressure be calculated from partial pressures?
Adding all partial pressures together
How is mole fraction calculated?
number of moles of a gas / total number of moles of all gases
What value of Kc indicates that the reaction does not go?
Kc < 10^-10
What value of Kc indicates that the reactants predominate at equilibrium?
Kc ≈ 0.1
What value of Kc indicates an equal amount of products and reactants?
Kc ≈ 1
What value of Kc indicates that products predominate at equilibrium?
Kc ≈ 10
What value of Kc indicates that reaction goes to completion?
Kc > 10^10
What is the effect of changing pressure on Kp?
Kp stays constant, but position of equilibrium will alter to maintain the value
