Chapter 22, Problem 80A

Interpretation Introduction

Interpretation:

The result of increase in volume of the reaction vessel on the equilibrium for the given reaction needs to be explained.

Concept introduction:

According to Le Chatlier’s principle, the change in a system at equilibrium that is change in volume, number of moles of reactant or product and temperature results in the change in equilibrium direction. The change in equilibrium takes place to balance the change in volume, number of moles of reactant or product and temperature.

Explanation of Solution

The given reaction is as follows:

${\text{2SO}}_{\text{2}}\left(g\right)+{\text{O}}_{\text{2}}\left(g\right)\to 2{\text{SO}}_{\text{3}}\left(g\right)$

If volume of the reaction mixture increases, the equilibrium shift takes place in the direction that produces more moles of gas. The moles of gas on product side is 2 and that on the reactant side is 3 thus, reaction shifts in backward direction or reverse direction.