Calculating Kp?

Question

The oxidation of sulfur dioxide by oxygen to sulfur trioxide has been implicated as an important step in the formation of acid rain: 2 SO2(g) + O2(g) = 2 SO3(g). If the equilibrium partial pressures of SO2, O2, and SO3 are 0.564 bar, 0.102 bar, and 0.333 bar respectively at 1000 K, what is Kp at that temperature?

# a. 8.11

# b. 5.79

# c. 3.42

# d. 0.292

Answer 1

Use

Kp  =  [SO2]^2 [O2] divided by [SO3]^2

The answer is d.

its always product/reactants

and the balancing coefficient goes to the power of the compound

hope tht helps

Answer 2

pSO3=0.333

pSO2=0.564

pO2=0.102

2SO2+O2=2SO3

Kp= pSO3^2/pSO2^2*pO2

= (0.333)^2/(0.564^2)*0.102= 3.42