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Module 5: Physical chemistry and transition elements (5.2.2 Enthalpy and entropy)

Quick questions on Entropy and Gibbs Free Energy (5.2.2) - OCR A-Level Chemistry A

2short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.

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State whether the entropy change is positive or negative for 2H2(g)+O2(g)→2H2O(l)2\text{H}_2(g) + \text{O}_2(g) \rightarrow 2\text{H}_2\text{O}(l), and why. [2 marks]
What is q2?
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A reaction has ΔH=+20 kJ mol−1\Delta H = +20\ \text{kJ mol}^{-1} and ΔS=+50 J K−1mol−1\Delta S = +50\ \text{J K}^{-1}\text{mol}^{-1}. Find the temperature above which it is feasible. [2 marks]

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