1. Please consider a pure substance undergoing a phase change. For a pure substance, the temperature will be constant during a phase change. a. Please show the integrate of the Definition of Entropy to show that for the phase change of a pure substance %3D Tph where the superscript "ph" indicates a phase change. b. Please show the reduction of the Energy Balance for a pure substance for during a phase change to show that -ph Ah' c. Please substitute the result in Part b into the result in Part a to show that ph Ah' Tph

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