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United StatesChemistryQuick questions

Unit 9: Applications of Thermodynamics

Quick questions on Absolute entropy and entropy change - AP Chemistry Unit 9

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.

What is q1?
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A reaction's products have total S∘=400S^\circ = 400 and its reactants S∘=520 J mol−1K−1S^\circ = 520\ \text{J mol}^{-1}\text{K}^{-1}. Calculate ΔS∘\Delta S^\circ. [2 points]
What is q2?
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Explain why absolute entropies are positive for all substances, unlike enthalpies of formation. [2 points]

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