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Chemistry · L4 · Finding the crossover temperature (CaCO₃ decomposition)

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Worked process for finding and interpreting the crossover temperature T = ΔH/ΔS, using limestone decomposition as the running example.

by @openstemUpdated Chemistry
ΔH and ΔS haveopposite signs(case 3 or case 4)Set ΔG = 0 and solve:T_crossover = ΔH / ΔSCaCO₃(s) → CaO(s) + CO₂(g)ΔH ≈ +178 kJ/molΔS ≈ +161 J/(mol·K)T_crossover ≈ 1106 K (833 °C)Below 1106 K:ΔG > 0 — non-spontaneouslimestone stays intactAbove 1106 K:ΔG < 0 — spontaneousCO₂ is driven off in a lime kiln

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