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2. (25 pts) A substance is changing phase from a solid to liquid. What are the signs for AH and AS? Under what conditions is

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2. 1. For solid to liquid ΔH>0; enthalpy increases (endothermic process) and when a solid becomes a liquid, its entropy increases. Therefore \Delta S > 0. As the randomness of particles is increasing.

2. The process of phase change will be spontaneous when \Delta Suniverse = \Delta Ssystem + \Delta Ssurrounding > 0 . Another condition for spontaneous process is using Gibbs free energy. When ΔG<0 the process is exergonic and will proceed spontaneously in the forward direction to form more products.

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