The equilibrium constant Kc for the reaction
equals 4.1 at 300°C.
- a A sample of 35.8 g of PCl5 is placed in a 5.0-L reaction vessel and heated to 300°C. What are the equilibrium concentrations of all of the species?
- b What fraction of PCl5 has decomposed?
- c If 35.8 g of PCl5 were placed in a 1.0-L vessel, what qualitative effect would this have on the fraction of PCl5 that has decomposed (give a qualitative answer only; do not do the calculation)? Why?
(a)
Interpretation:
The equilibrium composition of the given reaction mixture has to be found and the fraction of decomposition of
Concept introduction:
Equilibrium constant
Consider the reaction where the reactant A is giving product B.
On rearranging,
Where,
Answer to Problem 14.103QP
The equilibrium mixture contains
Explanation of Solution
Given,
The weight of
Molecular weight of
Volume of the vessel
To find the initial concentration of
The concentration of
To find the equilibrium composition.
Using the table approach, the equilibrium concentrations of the reactants and the products can be found.
The equilibrium values are then substituted into the equilibrium expression to get the change in concentration x.
On rearranging we get a quadratic equation.
On solving the quadratic equation the value of x obtained.
On solving we get two values for x, the positive value for x is taken.
Hence,
(b)
Interpretation:
The equilibrium composition of the given reaction mixture has to be found and the fraction of decomposition of
Concept introduction:
Equilibrium constant
Consider the reaction where the reactant A is giving product B.
On rearranging,
Where,
Answer to Problem 14.103QP
The fraction of
Explanation of Solution
To find the fraction of
(c)
Interpretation:
The equilibrium composition of the given reaction mixture has to be found and the fraction of decomposition of
Concept introduction:
Equilibrium constant
Consider the reaction where the reactant A is giving product B.
On rearranging,
Where,
Answer to Problem 14.103QP
Increase in pressure will shift equilibrium towards left and the rate of decomposition of
Explanation of Solution
Initially
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Chapter 14 Solutions
Lab Manual Experiments in General Chemistry
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