Zadanie 22
Which condition applies to a reaction mixture that has reached equilibrium at constant temperature and pressure? A. ΔH = 0 B. ΔG = 0 C. K = 1 D. ΔSsystem = 0
ΔG, reaction quotient and approach to equilibrium
Explain that ΔG becomes less negative as a reaction proceeds and reaches zero at equilibrium, and use ΔG = ΔG° + RT lnQ to find the driving force at a given composition and ΔG° = -RT lnK to link standard Gibbs energy to K.
Tę umiejętność sprawdza 7 zadań wzorowanych na arkuszach IB z lat 2023–2025.
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Zadanie 24
A reaction mixture is moving towards equilibrium, and the forward reaction is proceeding faster than the reverse reaction. Which statement is correct? A. Q > K and ΔG > 0 B. Q < K and ΔG < 0 C. Q decreases towards zero while K remains…
Zadanie 23
Which statements about the position of equilibrium are correct? ΔG⊖ = −RTln K I. If ΔG⊖ > 0, then K < 1 and the reactants are favoured. II. At equilibrium, ΔG⊖ is equal to zero. III. If ΔG⊖ = 0,…
Zadanie 2a
In air, sulfur dioxide can be oxidized to sulfur trioxide. The reaction is reversible, and at high temperature it reaches equilibrium in a closed container. 2 SO2(g) + O2(g) ⇌ 2 SO3(g) (i) At 600 °C the equilibrium constant, K, for this reaction is…
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Zadanie 17
A reversible reaction in a closed vessel at constant temperature and pressure has reached equilibrium. Which statement is correct? A. The change in Gibbs energy, ΔG, is zero B. The standard change in Gibbs energy, ΔG⊖, is zero C.…
Zadanie 23
A reaction has a standard Gibbs energy change, ΔG⊖, of −8.0 kJ mol−1 at 298 K. Which statement about the equilibrium constant, K, and the equilibrium mixture is correct? A. K < 1; the equilibrium mixture contains mostly…
Zadanie 4a
(i) Calculate the enthalpy change of this reaction using section 13 of the data booklet together with the values given below: (ii) Outline why the entropy change of this reaction is expected to be small. (iii) Ignoring any entropy change, estimate the…
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