Calculate the reaction quotient Q from the concentrations at a given moment, compare it with K and state whether the mixture will shift towards products (Q less than K), towards reactants (Q greater than K) or is already at equilibrium.
Tę umiejętność sprawdza 9 zadań wzorowanych na arkuszach IB z lat 2022–2026.
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…
The system A(g) + B(g) ⇌ 2 C(g) has an equilibrium constant K = 2.5 × 10−2. What is correct about the direction of the spontaneous change when Q = 3.0? In each option the first part states which species are in excess and the second part the…
At 700 K the equilibrium constant, K, of the reaction below is 54.0. H2(g) + I2(g) ⇌ 2 HI(g) At one moment the mixture contains: What can be concluded about the mixture at this moment? A. The system is at…
The gas-phase decomposition below has reached equilibrium in a sealed vessel: PCl5(g) ⇌ PCl3(g) + Cl2(g) ΔH⊖ = +88 kJ mol−1 The pressure is then changed. Which row pairs the change correctly with the direction in which the…
(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.…
Sulfur dioxide and oxygen react reversibly: 2 SO2(g) + O2(g) ⇌ 2 SO3(g) At a certain temperature the equilibrium constant is K = 4.0. A mixture at this temperature has the following concentrations, in mol dm−3: [SO2] = 0.50,…
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…
Sulfuryl chloride, SO2Cl2, is made industrially from sulfur dioxide and chlorine in the presence of an activated carbon catalyst. SO2(g) + Cl2(g) ⇌ SO2Cl2(g) ΔH⊖ < 0 (i) Sketch a potential energy profile for the forward reaction,…
(i) Deduce the expression for the equilibrium constant, Kc, for this equation. (ii) State how the use of a catalyst affects the value of Kc. (iii) Using the reaction quotient, Q, explain why raising the pressure at constant temperature increases the…
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