Given the gas-phase reaction: 2SO2(g) + O2(g) -> 2SO3(g) suppose that the reacti
ID: 819632 • Letter: G
Question
Given the gas-phase reaction:
2SO2(g) + O2(g) -> 2SO3(g)
suppose that the reaction has already taken place, and the system has come to equilibrium. If the following changes are made to the system in equilibrium, tell what effect these changes will have on the system (whether the equilibrium is shifted to the left, is shifted to the right, or is not shifted).
a. Additional O2 is added to the system.
b. Sulfur trioxide is removed from the system as soon as it forms.
c. the pressure of the system is decreased (all components are gases).
d. a very efficient catalyst is used for the reaction.
Explanation / Answer
2 SO2(g) + O2(g) <=> 2 SO3(g)
(a) Adding O2 => too much reactant present
=> equilibrium shifts to right according to Le Chatelier's principle
(b) Removing SO3 => too little product present
=> equilibrium shifts to right according to Le Chatelier's principle
(c) Decreasing pressure => increasing volume
=> more moles of gas favored
=> equilibrium shifts to left according to Le Chatelier's principle
(d) Catalyst has no effect on equilibrium position
=> equilibrium is not shifted
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