Chemistry Practice Problems Equilibrium Expressions Practice Problems Solution: The oxidation of sulfur dioxide by oxygen to sulfu...

Solution: 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 atm, 0.102 atm and 0.333 atm, respectively at 1000 K, what is Kp at this temperature?A. 0.292 B. 3.42 C. 5.79 D. 8.11E. 6.05

Problem

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 atm, 0.102 atm and 0.333 atm, respectively at 1000 K, what is Kp at this temperature?

A. 0.292 

B. 3.42 

C. 5.79 

D. 8.11

E. 6.05

Solution

We’re being asked to determine the equilibrium constant (Kp) at 1000 K for this reaction:


2 SO2(g) + O2(g) ⇌ 2 SO3(g)


Recall that the equilibrium constant is the ratio of the products and reactants

We use Kp when dealing with pressure and Kc when dealing with concentration:


Kp=PproductsPreactants     Kc=[products][reactants]


Note that solid and liquid compounds are ignored in the equilibrium expression.


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