Assume that H and S are independent of temperature and use data in Appendix 2A to calculate

Assume that ΔH° and ΔS° are independent of temperature and use data in Appendix 2A to calculate ΔG° for each of the following reactions at 80.°C. Over what temperature range will each reaction be spontaneous under standard conditions?

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(a) B₂O3(s) + 6 HF(g) → 2 BF3(g) + 3 H₂O(1) (b) CaC₂ (s) + 2 HCl(aq) →→→ CaCl₂(aq) + C₂H₂(g) diamond) - (c) C(s, graphite)C(s,