To determine The verification of the equation ( h g − h f ) = T ( s g − s f ) for phase change of water from saturated liquid to saturated vapor. Explanation Write the T d s equation. T d s = d h − V d p (I) Here, temperature is T , entropy change is d s , enthalpy change is d h , volume is V and pressure change is d p . Since the phase change of water from saturated liquid to saturated vapor is at constant pressure, d p = 0 . Substitute 0 for d p in Equation (I). T d s = d h − V ( 0 ) T d s = d h d s = d h T (II) Integrate Equation (II) from properties at liquid state to properties at vapor stage. ∫ s f s g d s = ∫ h f

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Properties of Pure Substances

A substance with fixed chemical composition throughout is called a pure substance like water, air, and nitrogen. A pure substance does not have to be a single element or compound. A mixture of two or more phases of a pure substance is also a pure substan…

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Chapter 6.13, Problem 15CU

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The verification of the equation (hg−hf)=T(sg−sf) for phase change of water from saturated liquid to saturated vapor.

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Chapter 6.13, Problem 14CU

Chapter 6.13, Problem 16CU

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