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青州's Question
Chemistry
Posted 9 months ago

Calculate ΔS\Delta \mathrm{S}^{\circ} for the following reaction: SnCl4(l)SnCl(g)\mathrm{SnCl}_{4}(\mathrm{l}) \rightarrow \mathrm{SnCl}(\mathrm{g}).
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Answer from Sia
Posted 9 months ago
Solution
1
Identify the reaction: The given reaction is SnCl4(l)SnCl(g) \mathrm{SnCl}_{4}(\mathrm{l}) \rightarrow \mathrm{SnCl}(\mathrm{g})
2
Determine the standard entropy change ($\Delta S^{\circ}$): To calculate ΔS\Delta S^{\circ}, we need the standard molar entropies (SS^{\circ}) of the reactants and products. The formula is: ΔS=S(products)S(reactants) \Delta S^{\circ} = \sum S^{\circ}(\text{products}) - \sum S^{\circ}(\text{reactants}) Given the standard molar entropies: - S(SnCl4(l))=SSnCl4(l)S^{\circ}(\mathrm{SnCl}_{4}(\mathrm{l})) = S^{\circ}_{\mathrm{SnCl}_{4}(\mathrm{l})} - S(SnCl(g))=SSnCl(g)S^{\circ}(\mathrm{SnCl}(\mathrm{g})) = S^{\circ}_{\mathrm{SnCl}(\mathrm{g})} The calculation is: ΔS=SSnCl(g)SSnCl4(l) \Delta S^{\circ} = S^{\circ}_{\mathrm{SnCl}(\mathrm{g})} - S^{\circ}_{\mathrm{SnCl}_{4}(\mathrm{l})}
Answer
The standard entropy change (ΔS\Delta S^{\circ}) for the reaction is calculated using the standard molar entropies of the reactants and products.
Key Concept
Standard entropy change (ΔS\Delta S^{\circ})
Explanation
The standard entropy change for a reaction is determined by subtracting the sum of the standard molar entropies of the reactants from the sum of the standard molar entropies of the products.

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