Spontaneous-change-questions-small

# Spontaneous-change-questions-small - At what temperatures...

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The Δ S° accompanying the conversion of solid rhombic sulfur to its monoclinic form is 1.09 J/mol·K at 95.5°C. What is Δ H° for this transition? At what temperatures will the following be spontaneous? C 5 H 12 (g) + 8O 2 (g) → 5C O 2 (g) + 6H 2 O(g) Δ H°= ? N 2 (g) + 3H 2 (g) → 2NH 3 (g) Δ H°= -92 kJ/mol 2C(graphite) + 2H 2 (g) → C 2 H 4 (g) Δ H°= 52 kJ/mol I 2 (g) → 2 I (g) Δ H°= ? 2NH 4 NO 3 (s) → O 2 (g) + 2N 2 (g) + 4H 2 O(g) Δ H°= -236 kJ/mol What is Δ S° for the freezing of water at 1 atm pressure? Δ fus = 6.02 kJ/mol What is Δ vap for Br 2 (l)? Use this value to estimate the normal boiling point for Br 2 (l).

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Calculate ΔS ° at 25°C for the following reactions: 2NO(g) + O 2 (g) → 2NO 2 (g) ΔS °= N 2 (g) + 3H 2 (g) → 2NH 3 (g) ΔS °= For the following reaction, ΔS °= 138.5 J/K. What is S° for N 2 O 3 ? 2N 2 O 3 (g) → 3O 2 (g) + 2N 2 (g) Calculate Δ G° at 298 K for each of the following using the information provided, or some other means: 2NO(g) + O 2 (g) → 2NO 2 (g) ΔH°= - 114.1 kJ, ΔS°= -146.5 J/K 4Fe (s) + 3O 2 (g) → 2Fe 2 O 3 (s) ΔH°= -1648 kJ, ΔS°= -549.3 J/K N 2 (g) + 3H 2 (g) → 2NH 3 (g) 2C (graphite) + 2H 2 (g) → C 2 H 4 (g)
The decomposition of isopropanol has an equilibrium constant of 0.444 at 452 K.

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