Calculate ΔG° (in kJ) for a reaction where ΔH°= +63 kJ, ΔS°= +675 J/K, and T = 298 K. Use the formula ΔG° = ΔH° - TΔS°.

Determine if reaction is spontaneous under standard conditions, if not at what temperature will it be spontaneous?

3 A (g) + 5 B (s) → 3 AB (s) + B₂ (g)       ∆H° = 112.7 kJ, ∆S° = 78.3 J/K.

Nickel has ∆H_vap = 370.4 kJ/mol and ∆S_vap = 123.3 J/mol•K. Will nickel boil at 2700 °C and 1 atm?

Fe₂O₃ (s) + 3 H₂ (g) → 2 Fe (s) + 3 H₂O (g) is a redox reaction. What would be its Gibbs Free energy change under standard conditions? Is the reaction spontaneous at 25 °C?