   Chapter 15, Problem 27PS

Chapter
Section
Textbook Problem

Dinitrogen trioxide decomposes to NO and NO2, in an endothermic process (ΔrH° = 40.5 kJ/mol-rxn).N2O3(g) → NO(g) + NO2(g)Predict the effect of the following changes on the position of the equilibrium; that is, state which way the equilibrium will shift (left, right, or no change) when each of the following changes is made. (a) adding more N2O3(g) (b) adding more NO2(g) (c) increasing the volume of the reaction flask (d) lowering the temperature

(a)

Interpretation Introduction

Interpretation: The effect of the given changes on the position of the equilibrium of given reaction has to be predicted.

Concept introduction:

• Chemical equilibrium: The term applied to reversible chemical reactions. It is the point at which the rate of the forward reaction is equal to the rate of the reverse reaction. The equilibrium is achieved when the concentrations of reactants and products become constant.
• Equilibrium constant: At equilibrium the ratio of products to reactants has a constant value. And it is represented by the letter K.

For a general reaction, aA+bBcC+dD

The equilibrium constant Kc = [C]c[D]d[A]a[B]b    a, b, c and d are the stoichiometric coefficients of reactant and product in the reaction. Concentration value for solid substance is 1.

If the value of Kc and the concentration of any of the reactant of a reaction is known then the concentration of product can be determined by multiplying Kc with the concentration of reactant.

• Concentration =AmountofsubstanceVolume
• Le Chatelier’s principle states that if a system in chemical equilibrium is subjected to a disturbance (in concentration, pressure, temperature..,) it tends to change in a way that opposes this disturbance.
• Forward Reaction: This type of reaction has involved irreversible, if obtained product cannot be converted back in to respective reactants under the same conditions. Backward Reaction: This type of reaction process involved a reversible, if the products can be converted into a back to reactants.
• In an endothermic reaction there is a net abortion of energy.
Explanation

The balanced equation for the given reaction is,

N2O3(g)NO(g)+NO2(g)

This is an endothermic reaction (ΔrH0=40

(b)

Interpretation Introduction

Interpretation: The effect of the given changes on the position of the equilibrium of given reaction has to be predicted.

Concept introduction:

• Chemical equilibrium: The term applied to reversible chemical reactions. It is the point at which the rate of the forward reaction is equal to the rate of the reverse reaction. The equilibrium is achieved when the concentrations of reactants and products become constant.
• Equilibrium constant: At equilibrium the ratio of products to reactants has a constant value. And it is represented by the letter K.

For a general reaction, aA+bBcC+dD

The equilibrium constant Kc = [C]c[D]d[A]a[B]b    a, b, c and d are the stoichiometric coefficients of reactant and product in the reaction. Concentration value for solid substance is 1.

If the value of Kc and the concentration of any of the reactant of a reaction is known then the concentration of product can be determined by multiplying Kc with the concentration of reactant.

• Concentration =AmountofsubstanceVolume
• Le Chatelier’s principle states that if a system in chemical equilibrium is subjected to a disturbance (in concentration, pressure, temperature..,) it tends to change in a way that opposes this disturbance.
• Forward Reaction: This type of reaction has involved irreversible, if obtained product cannot be converted back in to respective reactants under the same conditions. Backward Reaction: This type of reaction process involved a reversible, if the products can be converted into a back to reactants.
• In an endothermic reaction there is a net abortion of energy.

(c)

Interpretation Introduction

Interpretation: The effect of the given changes on the position of the equilibrium of given reaction has to be predicted.

Concept introduction:

• Chemical equilibrium: The term applied to reversible chemical reactions. It is the point at which the rate of the forward reaction is equal to the rate of the reverse reaction. The equilibrium is achieved when the concentrations of reactants and products become constant.
• Equilibrium constant: At equilibrium the ratio of products to reactants has a constant value. And it is represented by the letter K.

For a general reaction, aA+bBcC+dD

The equilibrium constant Kc = [C]c[D]d[A]a[B]b    a, b, c and d are the stoichiometric coefficients of reactant and product in the reaction. Concentration value for solid substance is 1.

If the value of Kc and the concentration of any of the reactant of a reaction is known then the concentration of product can be determined by multiplying Kc with the concentration of reactant.

• Concentration =AmountofsubstanceVolume
• Le Chatelier’s principle states that if a system in chemical equilibrium is subjected to a disturbance (in concentration, pressure, temperature..,) it tends to change in a way that opposes this disturbance.
• Forward Reaction: This type of reaction has involved irreversible, if obtained product cannot be converted back in to respective reactants under the same conditions. Backward Reaction: This type of reaction process involved a reversible, if the products can be converted into a back to reactants.
• In an endothermic reaction there is a net abortion of energy.

(d)

Interpretation Introduction

Interpretation: The effect of the given changes on the position of the equilibrium of given reaction has to be predicted.

Concept introduction:

• Chemical equilibrium: The term applied to reversible chemical reactions. It is the point at which the rate of the forward reaction is equal to the rate of the reverse reaction. The equilibrium is achieved when the concentrations of reactants and products become constant.
• Equilibrium constant: At equilibrium the ratio of products to reactants has a constant value. And it is represented by the letter K.

For a general reaction, aA+bBcC+dD

The equilibrium constant Kc = [C]c[D]d[A]a[B]b    a, b, c and d are the stoichiometric coefficients of reactant and product in the reaction. Concentration value for solid substance is 1.

If the value of Kc and the concentration of any of the reactant of a reaction is known then the concentration of product can be determined by multiplying Kc with the concentration of reactant.

• Concentration =AmountofsubstanceVolume
• Le Chatelier’s principle states that if a system in chemical equilibrium is subjected to a disturbance (in concentration, pressure, temperature..,) it tends to change in a way that opposes this disturbance.
• Forward Reaction: This type of reaction has involved irreversible, if obtained product cannot be converted back in to respective reactants under the same conditions. Backward Reaction: This type of reaction process involved a reversible, if the products can be converted into a back to reactants.
• In an endothermic reaction there is a net abortion of energy.

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