At a particular temperature, 12.6 mol of so3 is placed into a 4.0-l rigid container, and the so3 dissociates by the reaction given below. 2 so3(g) equilibrium reaction arrow 2 so2(g) + o2(g) at equilibrium, 3.4 mol of so2 is present. calculate k for this reaction.

At equilibrium, Kc = 0.058

Explanation:

Step 1: Data given

Mol SO3 = 12.6

Volume = 4.0 L

At equilibrium we have:

3.4 mol of SO2

Step 2: The balanced equation

2SO3(g) + ⇆ 2SO2(g) + O2(g)

Step 3: ICE-chart

The initial number of moles are:

SO3: 12.6 moles

SO2 : 0 mol

O2: 0 mol

There will react:

SO3: -2x

SO2: +2x

O2: +x

The number of moles at the equilibrium are:

SO3: 12.6 - 2x

SO2: 2x  = 3.4 mol

O2: x

Since at the equilibrium, we have 2x = 3.4 mol. x = 1.7 mol

This means at the equilibrium we have 1.7 mol of O2 and 12.6 -3.4 = 9.2 mol of SO3

Step 4: Calculate the equilibrium constant Kc

Kc = [3.4/4]² *[1.7/4] / [9.2/4]²

Kc = 0.058

At equilibrium, Kc = 0.058

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