9th Edition
Steven S. Zumdahl
ISBN: 9781133611097




9th Edition
Steven S. Zumdahl
ISBN: 9781133611097
Textbook Problem

At 25°C, Kp = 2.9 × 10–3 for the reaction

   NH 4 OCONH 2 ( s ) 2 NH 3 ( g ) + CO 2 ( g )

  In an experiment carried out at 25°C, a certain amount of NH4OCONH2 is placed in an evacuated rigid container and allowed to come to equilibrium. Calculate the total pressure in the container at equilibrium.

Interpretation Introduction


The equilibrium constant for the decomposition reaction of NH4OCONH2(s) is given. The value of total equilibrium pressure is to be calculated.

Concept introduction:

The state when the reactants involved in a chemical reaction and the products formed in the reaction exist in concentrations having no further tendency to change is known as an equilibrium state of the reaction.  When the equilibrium constant is expressed in terms of pressure, it is represented as Kp .



The equilibrium constant is 2.9×103 .

The stated reaction is,


It is assumed that the initial pressure of reactant is x and change in pressure of CO2 is y .

The initial pressure of product is,

(PNH3)= 0(PCO2)= 0

On the reaction with one molecule of NH4OCONH2(s) , the equilibrium reaction is,


At equilibrium, the equilibrium ratio is expressed by the formula,



  • Kp is the equilibrium constant

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