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Physical Chemistry (PI4.2 Entropy and feasibility of reactions)

Quick questions on Entropy and Feasibility of Reactions (PI4.2) - Eduqas A-Level Chemistry

3short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.

What are sign of ΔS\Delta S from gas moles?
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Base the prediction on the change in moles of gas, not total moles; forming a gas from solids gives a large positive ΔS\Delta S.
What is q1?
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Predict the sign of the entropy change for the reaction 2H2O2(l)→2H2O(l)+O2(g)2\text{H}_2\text{O}_2(\text{l}) \rightarrow 2\text{H}_2\text{O}(\text{l}) + \text{O}_2(\text{g}). [1 mark]
What is q2?
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A reaction has ΔH=−100 kJ mol−1\Delta H = -100\ \text{kJ mol}^{-1} and ΔS=+50 J K−1mol−1\Delta S = +50\ \text{J K}^{-1}\text{mol}^{-1}. Calculate ΔG\Delta G at 300 K300\ \text{K} and state whether it is feasible. [2 marks]

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