Zadanie 2a
Wzorowane na: Chemistry SL Paper 2, May 2023, TZ2, pytanie 2(a). Treść, dane i kontekst są zmienione; sprawdzane umiejętności, format i punktacja jak w oryginale.
Darmowe konto pozwoli wrócić do niego później.
Informacja do zadań 2a-2d.
Atmospheric pollutants include oxides of sulfur, which cause acid deposition, and ozone, which is formed in photochemical smog.
Polecenie
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 105. Outline what this indicates about the extent of the reaction.
(ii) Calculate the value of K at 600 °C for the equilibrium 2 SO3(g) ⇌ 2 SO2(g) + O2(g).
Sprawdź rozwiązanieUkryj rozwiązanieKlucz i punktacja
Odpowiedź z klucza
(i) the equilibrium lies to the right / products are favoured «at equilibrium»
OR
the equilibrium mixture contains a greater concentration of products than of reactants ✔
(ii) «» = 9.52 × 10−3 ✔
Schemat punktowania
[1] for each of (i) and (ii). (i) must refer to the position of equilibrium (products favoured); a statement that the reaction goes to completion scores zero. (ii) Accept 0.00952 or 9.5 × 10−3.