
(a)
Interpretation:
The equilibrium pressure of
Concept introduction:
Equilibrium constant
In gas phase reactions, partial pressure is used to write equilibrium equation than molar concentration. Equilibrium constant
Consider the reaction where A reacts to give B.
On rearranging,
Where,
The pressure of each species of ideal gas and its molar concentration are directly proportional to each other.
In same way
Where,
R is gas constant
T is absolute temperature
(b)
Interpretation:
The given reaction is endothermic or exothermic has to be identified.
Concept introduction:
Le Chatelier's principle states that if a system in equilibrium gets disturbed due to modification of concentration, temperature, volume, and pressure, then it reset to counteract the effect of disturbance.
Effect of change in temperature:
Endothermic reaction: In this reaction increase in temperature which is absorbed in reactant side, the reaction occurs in a way to relieve the stress in reactant side. The reaction occurs along the direction of product side and increases equilibrium constant.
Exothermic reaction: In this reaction increase in temperature which is released in product side, the reaction occurs in a way to relieve the stress in product side. The reaction occurs along the direction of reactant side and decreases equilibrium constant.
(c)
Interpretation:
The calculated pressure of
Concept introduction:
Reaction quotient (Q):
Reaction quotient (Q) is the ratio of product of concentration of products to that of product of concentration of reactants, raised to the power of coefficients.
Consider a reaction
Where,
a, b, c and d are coefficients of each species.
t is arbitrary time for measuring concentration .
Figure 1

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Chapter 13 Solutions
General Chemistry: Atoms First
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