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Thermodynamics (A-level only)

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Question 11

For a particular endothermic reaction, ΔHθ=+135 kJ mol−1\Delta H^\theta = +135\text{ kJ mol}^{-1}ΔHθ=+135 kJ mol−1 and ΔSθ=+270 J K−1 mol−1\Delta S^\theta = +270\text{ J K}^{-1}\text{ mol}^{-1}ΔSθ=+270 J K−1 mol−1.

Which statement is correct about the feasibility of this reaction?

A

The reaction is feasible at temperatures above 227 ∘C227\text{ }^\circ\text{C}227 ∘C

B

The reaction is feasible at temperatures below 227 ∘C227\text{ }^\circ\text{C}227 ∘C

C

The reaction is feasible at temperatures above 500 ∘C500\text{ }^\circ\text{C}500 ∘C

D

The reaction is feasible at temperatures below 500 ∘C500\text{ }^\circ\text{C}500 ∘C

Markscheme

Thermodynamics (A-level only) Questions

  1. A Level
  2. /Chemistry
  3. /Thermodynamics (A-level only)

27 exam-style questions on AQA A Level Chemistry Thermodynamics (A-level only), covering Born–Haber cycles (A-level only) and Gibbs free-energy change, $\Delta G$ , and entropy change, $\Delta S$ (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.

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