12-14The validity of the last Maxwell relation for refrigerant-134a at a specified state is to be verified.AnalysisWe do not have exact analytical property relations for refrigerant-134a, and thus we need to replace the differential quantities in the last Maxwell relation with the corresponding finite quantities. Using property values from the tables about the specified state,(29(29K/kgm101.0095K/kgm101.005C60)(100/kgm0.018404)(0.022442kPa1000)(1400KkJ/kg1.0458)(1.0056C60100kPa1000140034343?kPa1200C60C100?C80kPa1000kPa1400kPa1200?C80?⋅×-2245⋅×-°---2245-⋅-°---2245--∆∆-2245∆∆∂∂-=∂∂--=°°°==°=PTPTPTssTPsTPsvvvvsince kJ ≡kPa·m³, and K ≡°C for temperature differences. Thus the last Maxwell relation is satisfied.12-17Using the Maxwell relations, a relation for (
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