Equilibrium law and the expression for K

Chemia IBPaper 2, maj 2026, TZ1wzorowane5 pktotwarteśrednie (szac.)

Zadanie 1b

The second step converts nitrogen monoxide to nitrogen dioxide. 2 NO(g) + O₂(g) ⇌ 2 NO₂(g) ΔH^⊖ = −114 kJ mol⁻¹ (i) Identify the oxidation state of nitrogen in NO and in NO₂. (ii) State the equilibrium constant…

Chemia IBPaper 2, maj 2026, TZ3wzorowane9 pktotwarteśrednie (szac.)

Zadanie 2b

The oxidation of sulfur dioxide to sulfur trioxide is an equilibrium reaction. 2 SO₂(g) + O₂(g) ⇌ 2 SO₃(g) (i) State the equilibrium constant expression, K, for the reaction. (ii) Explain, with a reason, how compressing the gas mixture at constant…

• Materiał graficzny

Chemia IBPaper 1A, maj 2026, TZ2wzorowane1 pktzamkniętełatwe (szac.)

Zadanie 28

What is the equilibrium constant expression for the forward reaction? 2 SO₂(g) + O₂(g) ⇌ 2 SO₃(g) A. $K = \dfrac{2[\ce{SO3}]}{2[\ce{SO2}] + [\ce{O2}]}$ B. $K = \dfrac{[\ce{SO2}]^2[\ce{O2}]}{[\ce{SO3}]^2}$ C.…

Chemia IBPaper 1A, maj 2026, TZ3wzorowane1 pktzamkniętełatwe (szac.)

Zadanie 28

The equilibrium below is established at one temperature. PCl₅(g) ⇌ PCl₃(g) + Cl₂(g) K = 4.0 × 10⁻² What is K for the reverse reaction at this temperature? A. 2.5 × 10¹ B. 1.6 × 10⁻³ C. 4.0 × 10⁻² D.…

Chemia IBPaper 2, maj 2025, TZ1wzorowane1 pktotwartełatwe (szac.)

Zadanie 3a

State, in terms of equilibrium concentrations, the expression for K, the equilibrium constant of this reaction.

Chemia IBPaper 2, maj 2025, TZ1wzorowane2 pktobliczenioweśrednie (szac.)

Zadanie 3b

By the time equilibrium was reached, the vessel held 1.7 mol of H₂(g). Calculate the equilibrium amounts, in mol, of the three remaining gases, then use them to calculate K.

Chemia IBPaper 2, maj 2025, TZ3wzorowane8 pktobliczeniowetrudne (szac.)

Zadanie 3a

(i) An equilibrium mixture in a 25.0 dm³ reactor at 500 °C contains 15.0 mol N₂, 22.5 mol H₂ and 5.25 mol NH₃. Calculate the equilibrium constant, K, for the reaction. (ii) The volume of the reactor containing the equilibrium…

• Materiał graficzny

Chemia IBPaper 1A, maj 2025, TZ2wzorowane1 pktzamkniętełatwe (szac.)

Zadanie 29

The following system is at equilibrium. H₂(g) + I₂(g) ⇌ 2 HI(g) K = 54 What is the value of the equilibrium constant, K, for the reaction 2 HI(g) ⇌ H₂(g) + I₂(g)? A. −54 B. $\dfrac{1}{54}$ C. $\sqrt{54}$ D. $\dfrac{1}{\sqrt{54}}$

Chemia IBPaper 2, listopad 2025, TZ1wzorowane5 pktobliczenioweśrednie (szac.)

Zadanie 3e

(i) To check the value of K found in (d)(viii), a student set up an experiment: 0.500 mol each of propan-1-ol and ethanoic acid were mixed with a small amount of concentrated sulfuric acid at 25 °C, and the mixture's volume was kept constant throughout.…

Chemia IBPaper 1A, listopad 2025, TZ1wzorowane1 pktzamknięteśrednie (szac.)

Zadanie 31

Nitrogen reacts with hydrogen to form ammonia. N₂(g) + 3 H₂(g) ⇌ 2 NH₃(g) A mixture of 1.50 mol of N₂(g) and 4.20 mol of H₂(g) was placed in a 1.00 dm³ container at a certain temperature. At equilibrium the mixture contained…

Chemia IBPaper 2, specimen 2025wzorowane5 pktotwarteśrednie (szac.)

Zadanie 5f

Butan-2-ol reacts with octadecanoic (stearic) acid to form an ester that is used as a lubricant. C₁₇H₃₅COOH(l) + CH₃CH(OH)CH₂CH₃(l) ⇌ C₁₇H₃₅COOCH(CH₃)CH₂CH₃(l) + X(l) (i) Identify the by-product X(l) and state the type of reaction taking place. (ii)…

Chemia IBPaper 1A, specimen 2025wzorowane1 pktzamkniętełatwe (szac.)

Zadanie 28

Which expression correctly gives the equilibrium constant for the following reaction? 2 NO(g) + Cl₂(g) ⇌ 2 NOCl(g) A. $K_c = \dfrac{[\ce{NOCl}]^2}{[\ce{NO}]^2[\ce{Cl2}]}$ B. $K_c = \dfrac{[\ce{NO}]^2[\ce{Cl2}]}{[\ce{NOCl}]^2}$ C.…

Chemia IBPaper 1A, specimen 2025wzorowane1 pktzamknięteśrednie (szac.)

Zadanie 30

The equation for a reaction between gases X and Y is: 2 X(g) + Y(g) ⇌ 2 Z(g) At equilibrium at 700 K the concentrations of X, Y and Z are 0.50 mol dm⁻³, 0.40 mol dm⁻³ and 1.0 mol dm⁻³ respectively.…

Chemia IBPaper 2, maj 2024, TZ1wzorowane1 pktotwartełatwe (szac.)

Zadanie 3a

Deduce the expression for K_c of this reaction.

Chemia IBPaper 2, maj 2024, TZ2wzorowane1 pktotwartełatwe (szac.)

Zadanie 4a

Write the equilibrium constant expression, K_c, for this reaction.

Chemia IBPaper 2, maj 2024, TZ2wzorowane2 pktobliczenioweśrednie (szac.)

Zadanie 4b

At 298 K, K_c has the numerical value 1.50 × 10⁻³. Calculate the value of the ratio $\dfrac{[\ce{[CoCl4]^2-}]}{[\ce{Co^2+}]}$ in a solution in which [Cl⁻] is 6.00 mol dm⁻³.

Chemia IBPaper 1, maj 2024, TZ1wzorowane1 pktzamknięteśrednie (szac.)

Zadanie 22

The equilibrium constant for the reaction below is K_c = 280 at 700 K. 2 SO₂(g) + O₂(g) ⇌ 2 SO₃(g) What is the value of the equilibrium constant at 700 K for the following reaction? 6 SO₃(g) ⇌ 6 SO₂(g) + 3 O₂(g) A. $\dfrac{1}{3 \times 280}$ B.…

Chemia IBPaper 1, maj 2024, TZ2wzorowane1 pktzamknięteśrednie (szac.)

Zadanie 26

1.50 mol of NO and 0.80 mol of O₂ are mixed in a 2.0 dm³ container and allowed to reach equilibrium at a certain temperature. 2 NO(g) + O₂(g) ⇌ 2 NO₂(g) There was 1.20 mol of NO₂ present in the container at equilibrium. What…

Chemia IBPaper 2, maj 2023, TZ1wzorowane9 pktobliczenioweśrednie (szac.)

Zadanie 2d

Sulfur trioxide is manufactured industrially by the oxidation of sulfur dioxide. 2 SO₂(g) + O₂(g) ⇌ 2 SO₃(g) ΔH^⊖ = −198.0 kJ mol⁻¹ (i) Outline what is meant by dynamic equilibrium. (ii) Deduce the K_c expression for this…

• Tabela do uzupełnienia

Chemia IBPaper 1, maj 2023, TZ1wzorowane1 pktzamknięteśrednie (szac.)

Zadanie 22

At a certain temperature the equilibrium constant for the reaction H₂(g) + I₂(g) ⇌ 2 HI(g) is K_c = 64. Which value is the equilibrium constant of the reaction below at that temperature? $\ce{HI(g) <=> 1/2 H2(g) + 1/2 I2(g)}$ A. 32 B. 8.0 C. 0.125 D.…

Chemia IBPaper 2, listopad 2023, TZ1wzorowane1 pktotwartełatwe (szac.)

Zadanie 2b

State the expression for the equilibrium constant, K_c, of this reaction.

Chemia IBPaper 2, listopad 2023, TZ2wzorowane1 pktotwartełatwe (szac.)

Zadanie 2b

State the expression for K_c for this reaction.

Chemia IBPaper 1, listopad 2023, TZ1wzorowane1 pktzamknięteśrednie (szac.)

Zadanie 24

The system 2 A(g) ⇌ 3 B(g) + C(g) is at equilibrium, and the concentrations of A, B and C are all 3 mol dm⁻³. What is K_c for this system? Ignore units. A. 0.11 B. 3 C. 9 D. 27

Chemia IBPaper 1, listopad 2023, TZ2wzorowane1 pktzamknięteśrednie (szac.)

Zadanie 24

The system 2 A(g) ⇌ 3 B(g) + C(g) is at equilibrium with the concentrations of A, B and C all equal to 3.0 mol dm⁻³. Which value is K_c for this system? A. 3 B. 27 C. 9 D. 81

Chemia IBPaper 2, maj 2022, TZ1wzorowane5 pktotwarteśrednie (szac.)

Zadanie 3a

(i) Deduce the expression for the equilibrium constant, K_c, for this equation. (ii) State how the use of a catalyst affects the value of K_c. (iii) Using the reaction quotient, Q, explain why raising the pressure at constant temperature increases the…

• Materiał graficzny

Chemia IBPaper 2, maj 2022, TZ2wzorowane1 pktotwartełatwe (szac.)

Zadanie 4c

Nitrogen dioxide is in equilibrium with colourless dinitrogen tetroxide in the gas phase. N₂O₄(g) ⇌ 2 NO₂(g) State the expression for the equilibrium constant, K_c, of this equilibrium.

Chemia IBPaper 1, maj 2022, TZ1wzorowane1 pktzamknięteśrednie (szac.)

Zadanie 22

At a certain temperature, K_c = 12 for the reaction $\ce{1/2 H2(g) + 1/2 Br2(g) <=> HBr(g)}$ What is the value of K_c, at the same temperature, for the reaction below? H₂(g) + Br₂(g) ⇌ 2 HBr(g) A. 12² B. 2 × 12 C. $\dfrac{1}{12^2}$ D.…

Chemia IBPaper 1, maj 2022, TZ2wzorowane1 pktzamknięteśrednie (szac.)

Zadanie 22

The equilibrium constant, K_c, for the reaction A + 2 B ⇌ 3 C + D has a value of 3.0 at a certain temperature. What is the value of K_c for the reaction below at the same temperature? 6 C + 2 D ⇌ 2 A + 4 B A. 0.11 B. 0.33 C. 1.5 D. 9.0

Chemia IBPaper 1, maj 2022, TZ1wzorowane1 pktzamknięteśrednie (szac.)

Zadanie 23

The following equilibrium is established at a certain temperature. $\ce{1/2 N2(g) + 1/2 O2(g) <=> NO(g)} \qquad K_c = 3.0 \times 10^{-4}$ At equilibrium, [N₂] = 0.40 mol dm⁻³ and [O₂] = 0.10 mol dm⁻³. What is the…

Chemia IBPaper 1, maj 2022, TZ2wzorowane1 pktzamknięteśrednie (szac.)

Zadanie 23

A closed flask is filled with 1.0 mol of carbon monoxide and 1.0 mol of steam, and the mixture reaches equilibrium according to the equation below. CO(g) + H₂O(g) ⇌ CO₂(g) + H₂(g) At equilibrium the flask holds 0.75 mol of CO₂. What is…

Chemia IBPaper 1, listopad 2022wzorowane1 pktzamknięteśrednie (szac.)

Zadanie 22

For the reaction N₂(g) + 3 H₂(g) ⇌ 2 NH₃(g) at a certain temperature, the equilibrium concentrations, in mol dm⁻³, are: [N₂] = 0.10, [H₂] = 0.20, [NH₃] = 0.40 What is the value of K_c? A. 0.0050 B. 8.0 C.…