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, TZ3wzorowane7 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 22

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 22

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, TZ2wzorowane2 pktotwartełatwe (szac.)

Zadanie 1c

A related nitrile, ethanenitrile, CH₃CN, reacts with hydrogen according to the equilibrium: CH₃CN(g) + 2 H₂(g) ⇌ CH₃CH₂NH₂(g) (i) Write the expression for the equilibrium constant, K, for this reaction. (ii) Determine the oxidation states that…

Chemia IBPaper 1B, maj 2025, TZ3wzorowane1 pktobliczeniowełatwe (szac.)

Zadanie 1d

A sample of 0.0120 mol of NO₂ was sealed in a vessel of volume 1.00 dm³ and kept at 10.0 °C until equilibrium was established. At equilibrium, the vessel contained 0.00860 mol of NO₂ and 0.00170 mol of N₂O₄.…

Chemia IBPaper 2, maj 2025, TZ1wzorowane6 pktotwarteśrednie (szac.)

Zadanie 2b

When potassium thiocyanate solution is added to a pale yellow solution containing iron(III) ions, the following equilibrium is established. [Fe(H₂O)₆]³⁺(aq) + SCN⁻(aq) ⇌ [Fe(SCN)(H₂O)₅]²⁺(aq) + H₂O(l) [Fe(H₂O)₆]³⁺(aq) is pale yellow and…

• Materiał graficzny

Chemia IBPaper 2, maj 2025, TZ3wzorowane3 pktobliczeniowetrudne (szac.)

Zadanie 3a

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.

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

Zadanie 22

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, TZ1wzorowane4 pktobliczenioweśrednie (szac.)

Zadanie 3a

(i) Deduce the expression for the equilibrium constant, K, for this reaction. (ii) 0.500 mol each of propan-1-ol and ethanoic acid, together with a small amount of concentrated sulfuric acid, reacted at constant volume. At equilibrium,…

Chemia IBPaper 2, listopad 2025, TZ3wzorowane3 pktotwarteśrednie (szac.)

Zadanie 3f

Hexanoic acid, CH₃(CH₂)₄COOH, is a weak acid. The graph shows how the pH changes during the titration of a 20.0 cm³ aqueous solution of hexanoic acid with aqueous sodium hydroxide. (i) Deduce an expression for the equilibrium constant, K,…

• Materiał graficzny

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

Zadanie 24

What is the equilibrium constant expression for the following reaction? CH₄(g) + H₂O(g) ⇌ CO(g) + 3 H₂(g) A. $\dfrac{[\ce{CH4}][\ce{H2O}]}{[\ce{CO}][\ce{H2}]^3}$ B. $\dfrac{3[\ce{CO}][\ce{H2}]}{[\ce{CH4}][\ce{H2O}]}$ C.…

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

Zadanie 3a

Deduce the expression for K_c of this reaction.

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

Zadanie 3c

Hydrogen fluoride, HF, released by aluminium smelters, dissolves in water to form a weak acid. HF(aq) + H₂O(l) ⇌ H₃O⁺(aq) + F⁻(aq) (i) State the equilibrium constant expression, K_c, for this reaction. (ii) State, with a reason, the…

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

Zadanie 18

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 2, maj 2023, TZ1wzorowane6 pktotwarteśrednie (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…

• Materiał graficzny

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 2, maj 2022, TZ1wzorowane4 pktotwarteśrednie (szac.)

Zadanie 2c

Methanol is manufactured from carbon monoxide and hydrogen. The reaction involves the equilibrium: CO(g) + 2 H₂(g) ⇌ CH₃OH(g) (i) Deduce the expression for the equilibrium constant, K_c, for this equation. (ii) Explain why an increase in pressure…

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

Zadanie 18

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 18

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