Park F.

# HOW TO FIND EQUILIBRIUM KC AND KP

2.     Consider the following heterogeneous equilibrium.

CaCO3 (s)                  CaO (s) + CO2 (g)

At 800  the pressure of CO2 in 0.23 atm, calculate (a) Kp and (b) Kc for the reaction at this temperature.

Kp     = PCO2

= 0.236

1.  Consider the following equilibrium at 295K

NH4HS (s)                   NH3 (g) + H2S (g)

The partial pressure of each gas is 0.265 atm. Calculate Kp and Kc for         the reaction.

2.  2A(g) +  B(g)                C (g)

When 1.0 mol A and 0.75 mol B were allowed to achieve equilibrium at 65 C. In a container of 1 dm3 capacity, the equilibrium mixture was found to contain 0.7mol A and 0.6 mol B. Calculate Kc at 65 C.

3.  Write the expression for Kp for the following reaction.

N2(g)   +   3H2           2NH3 (g)       H = -184 kJmol-1

State and explain the effect (if any) of the following changes on the Kp and the amount of ammonia in the equilibrium mixture.

(a) Temperature is decreased

(b) Increasing pressure