What is the partial pressure
The pressure that the gas would exert on its own under the same conditions
What expression is used to calculate the partial pressure
Pa = xapt Pa = partial pressure xa = the mole of a Pt = total pressure
What’s the general formulae for calculating Kc
Kc = [C]y [D]z
————–
[A]w [B]x
wA + xB —->yC +zD
What are the 5 steps for working out Kc
1) Write the expression for Kc
2) Total the power for the top concentration
3) Total the power for the bottom concentration
4) work out (answer 2) - (answer 3)
5) Apply answer 4 to the concentration units, moldm-3
What’s the general equation for Kp
Kp = (pC)y (pD)z
——————–
(pA)w (pB)x
wA + xB —->yC +zD
What are the 5 steps for working out Kp
1) Write the expression for Kp
2) Total the powers for the top partial pressure
3) Total the power for the bottom partial pressure
4) Work out (answer 2) - (answer 3)
5) Apply answer 4 to the pressure units, atm
What happens to Kc/Kp when the reversible reaction is exothermic in the forward direction
Kc or Kp decreases with increasing temperature
What happens to Kc/Kp when the reversible reaction is endothermic in the forward direction
Kc or Kp increases with increasing temperature
What effect does concentration have on Kc o
Has no effect
What effect does adding a catalyst have on the Kc/Kp value
No effect on the value