Exercise 17.2 Write the equilibrium expression for eh of the following reactions.
a. 2KClO 3 ( s ) ⇌ 2 KCl ( s ) + 3 O 2 ( g )    This reaction is often used to produce oxygen gas in the laboratory.
b. NH 4 NO 3 ( s ) ⇌ N 2 O ( g ) + 2H 2 O ( g )    c. CO 2 ( g ) + MgO ( s ) ⇌ MgCO 3 ( s )    d. SO 3 ( g ) + H 2 O ( l ) ⇌ H 2 SO 4 ( l )

(a)

Interpretation:

The equilibrium expression for the given reaction is to be stated.

Concept Introduction:

The equilibrium expression for a reaction is the ratio of concentrations of products to reactants where each species is raised by the power of their coefficients in the balanced reaction.

K=[Product]b[Reactant]a

Where square brackets represents the concentration of the species, K is the equilibrium constant and a and b are stoichiometric coefficients.

The given reaction is,

2KClO3(s)⇌ 2KCl(s)+3O2(g)

This is an example of heterogeneous equilibrium

(b)

Interpretation:

The equilibrium expression for the given reaction is to be stated.

Concept Introduction:

The equilibrium expression for a reaction is the ratio of concentrations of products to reactants where each species is raised by the power of their coefficients in the balanced reaction.

K=[Product]b[Reactant]a

Where square brackets represents the concentration of the species, K is the equilibrium constant and a and b are stoichiometric coefficients.

(c)

Interpretation:

The equilibrium expression for the given reaction is to be stated.

Concept Introduction:

The equilibrium expression for a reaction is the ratio of concentrations of products to reactants where each species is raised by the power of their coefficients in the balanced reaction.

K=[Product]b[Reactant]a

Where square brackets represents the concentration of the species, K is the equilibrium constant and a and b are stoichiometric coefficients.

(d)

Interpretation:

The equilibrium expression for the given reaction is to be stated.

Concept Introduction:

The equilibrium expression for a reaction is the ratio of concentrations of products to reactants where each species is raised by the power of their coefficients in the balanced reaction.

K=[Product]b[Reactant]a

Where square brackets represents the concentration of the species, K is the equilibrium constant and a and b are stoichiometric coefficients.