BRAINCAKEExam-Style Questions - 4
Question. When steam is passed over hot iron in a closed container, this equilibrium is set up:
3Fe(s) + 4H2O(g) ⇌ Fe3O4(s) + 4H2(g)
(a) State whether this is a homogeneous or heterogeneous equilibrium. Give a reason. (1)
(b) Write the expression for Kc and state its units. (2)
(c) At equilibrium, [H2O] = 0.020 mol dm−3 and [H2] = 0.040 mol dm−3. Calculate Kc. (1)
(d) State the effect on the position of equilibrium of (i) increasing the pressure, (ii) adding more iron. (2)
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Key terms in this lesson
- equilibrium constant
- A value, Kc, expressing the ratio of product to reactant concentrations at equilibrium for a reaction at a given temperature.
More in Reversible Reactions and Dynamic Equilibrium
- Homogeneous Systems
- Heterogeneous Systems
- Industrial Processes
- The Contact Process
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- Exam-Style Questions - 2
- Exam-Style Questions - 3
- Exam-Style Questions - 5
All 18 lessons in Reversible Reactions and Dynamic Equilibrium · All Edexcel AS-level Chemistry topics