expression of equilibrium (Kc and Kp) and chemical industry

Which one ARE TRUE regarding expression of equilibrium constant, K_c ?

1.Power term in concentration term of equilibrium constant, K_c, is related to the number of molecules of every substrate participating in the reaction

2.Concentration used in the expression of equilibrium constant, , K_c, is the concentration of every reactant before the equilibrium

3. In the expression of equilibrium constant, K_c, the term of concentration of products are put on the numerator, whereas the term of concentration of reactants are put on the denominator

• 1, 2, and 3

• 1 and 2

• 1 and 3

• 2 and 3

Which one AREN'T TRUE about expression of equilibrium constant, K_c ?

1.Only substances in solid or pure liquid that can be included in concentration term of expression of K_c

2.Equilibrium constant, K_c, has no unit

3. The magnitude of K_c of any reaction at constant temperature can be altered if the the concentration of the reactants is changed

• 1,2 and 3

• 1 and 2

• 1 and 3

• 2 and 3

Which one can change value of K_c if it's altered after the equilibrium of reaction is achieved?

1.Pressure

2.Temperature

3.Concentration

• 1,2 and 3

• 1 and 2

• 2 and 3

• 2 only

Which one ARE TRUE regarding expression of equilibrium constant in gas reaction, K_p?

1.Partial pressure of gas involved in the reaction is used instead of concentration in the expression of K_p

2.Only the substance in gas state can be included in the expression of K_p

3.The value of K_p of any reaction that have no gaseous substance is 1

• 1, 2, and 3

• 1 and 2

• 1 and 3

• 2 and 3

the synthesis of ammonia is carried out by the haber process :

N₂(g) + 3H₂(g) ↔ 2NH₃(g) ΔH = -92 kJ mol^-1

Which change will bring about an increase the amount of ammonia, NH₃, in this reaction?

• Increasing the pressure of the reaction

• Adding some catalyst to the reaction

• Increase the temperature of the reaction

• Adding some ammonia to the reaction when equilibrium is reached

the synthesis of ammonia is carried out by the haber process :

N₂(g) + 3H₂(g) ↔ 2NH₃(g) ΔH = -92 kJ mol^-1

What would not increase the equilibrium yield of ammonia in this process?

• Removing the ammonia as it is formed by condensing it to liquid

• Decrease the temperature of the reaction

• Increase the pressure of the reaction

• Higher concentration of iron catalyst is added to the reaction

The contact process is used in manufacture of sulfuric acid. The reaction for the main reaction is shown below.

2SO₂(g) + O₂(g) ↔ 2SO₃(g) ΔH = -196 kJ mol^-1

WHICH statement about this reaction is CORRECT ?

1.Increase pressure gives a higher yield of gaseous SO₃

2.Increase temperature lower the amount of SO₃ produced in the reaction

3.Vanadium(III) oxide is used as a catalyst for this reaction

• 1, 2, and 3

• 1 and 2

• 2 and 3

• 1 and 3

The contact process is used in manufacture of sulfuric acid. The reaction for the main reaction is shown below.

2SO₂(g) + O₂(g) ↔ 2SO₃(g) ΔH = -196 kJ mol^-1

Which condition affect the value of the equilibrium constant, K_c, of this reaction

• adjusting the temperature of the reaction

• alter the pressure of the system

• Using a catalyst

• removing SO₃ from the equilibrium mixture

The reaction :

2HI(g) ↔ H₂(g) + I₂(g)

are in equilibrium. The reverse reaction is exothermic. How can the equilibrium constant K_c be increased?

• by lowering the temperature of the system

• by removing some gaseous H₂ and I₂ as it were formed

• by increasing the temperature of the system

• By adding inert gases to the system

In the manufacture of sulfuric acid, the reaction :

2SO₂(g) + O₂(g) ↔ 2SO₃(g)

usually takes place at 400 ^oC and 1 atm pressure. In one industrial plant, it is decided to change the pressure to 20 atm.

What will be the consequence of this change?

1.Increased running cost

2.an increase percentage of sulfur trioxide in the equilibrium mixture

3.The rate of forward reaction decrease

• 1, 2, and 3

• 1 and 2

• 1 and 3

• 2 and 3