Within a phase, a change in heat is accompanied by a change in temperature which is associated with a change in the average Ek as the most probable speed of the molecules changes.
Quantitative Aspects of Phase Changes
During a phase change, a change in heat occurs at a constant temperature, which is associated with a change in Ep, as the average distance between molecules changes.
q = (amount in moles)(molar heat capacity)(DT)
q = (amount in moles)(enthalpy of phase change)
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