
(a)
Interpretation:
The equilibrium constant
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:
At equilibrium, partial pressure of all gas in reaction has to be calculated. Also concentration of hydrogen gas in
Concept introduction:
Calculation of equilibrium partial pressure from initial partial pressure:
- The balanced equation for given reaction has to be written.
- Set up an equilibrium table to calculate x value
- The value of x is solved by substituting partial pressures of chemical species in equilibrium constant expression.
- The partial pressure of chemical species at equilibrium is calculated from value of x

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Chapter 13 Solutions
General Chemistry: Atoms First
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