Question

Calculating an equilibrium constant from..C C Sulfur dioxide and oxygen react to form sulfur trioxide, like this: 2 50,(0) + 0 (0) 250,(9) Also, a chemist finds that at a certain temperature the equilibrium mixture of sulfur dioxide, oxygen, and sulfur trioxide has the following composition: compound pressure at equilibrium SO 8.07 atm 62.6 atm SO, 56.2 atm Calculate the value of the equilibrium constant for this reaction. Round your answer to 2 significant digits. x 5 ?

Answer 1

For a gas phase reaction ,

aA+B=0C + dD

Kp  = [PC]c [PD ]d / [PA]a [PB] b

where PC , PD are the partial pressure of C and D at equilibrium

and PA , PB are the partial pressure of A and B at equilibrium

for reaction :

2SO2 (g) +   O2 (g) =  2 SO3 (g)

PSO2 = 8.07 atm

PO2 = 62.6 atm

P SO3  = 56.2 atm

hence , Kp = (56.2)2 / ( 8.07)2 (62.6)

= 0.7747 atm-1