Coexistance Curve Homework: C_(g)-C_(l) = T(delta_vapS)

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The discussion focuses on deriving the relationship between the heat capacities of gas and liquid phases along the liquid-gas coexistence curve, specifically showing that C(g) - C(l) = T(d/dT Δ(vap)S). It utilizes the equation Δ(vap)S = Δ(vap)H/T, emphasizing that Δ(vap)H is positive and decreases with increasing temperature. This leads to the conclusion that C(g) is less than C(l) at the vaporization temperature (Tvap). The participants are encouraged to demonstrate their own attempts at solving the problem to facilitate assistance. Overall, the discussion centers on thermodynamic principles governing phase transitions.
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Homework Statement


Consider the liquid-gas coexistence curve. Show that C_{(g)} − C_{(l)} = T(\stackrel{d}{dT} \Delta_{(vap)}S) for T, P along the coexistence curve. Now use the fact that
\Delta(vap)S = \Delta(vap)H/T along the coexistence curve, and the fact that \Delta(vap)H is positive and decreases with increasing T, to show that C(g) < C(l) . Note that this inequality applies only at Tvap.

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