Question

Calculate ΔS^◦₂98 for the following changes.

(a) SnC1₄(1) → SnCl₄(g)

(b) Cu(s) → Cu(g)

(e) 2H₂(g) +O₂(g) → 2H₂O(1)

Answer 1

To calculate ΔS° for various processes, one must use standard molar entropies from a source like Appendix G and sum the entropies of products and subtract the sum of entropies of reactants for each process.

Step-by-step explanation:

The student is asking to calculate the standard change in entropy (ΔS°) at 298 K for various physical and chemical processes. Calculations like this typically rely on tabulated values of standard molar entropy (S°) for each species involved in the process from a source such as Appendix G referenced in the question.

General Approach:

• Identify each species involved in the change.
• Look up the standard molar entropies (S°) from a data source such as Appendix G.
• Use the formula ΔS° = ΣS°(products) - ΣS°(reactants) to find the change in entropy for the process.

Specific calculations are not provided as the S° values for the species involved in the given processes were not included in the question details.