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Molal freezing point constant: −1.99 °C kg/mol Solid properties Std enthalpy change of formation, Δ f H o solid: −277.7 kJ/mol Standard molar entropy, S o solid: 160.7 J/(mol K) [5] Heat capacity, c p: 111.46 J/(mol K) [5] Liquid properties Std enthalpy change of formation, Δ f H o liquid: −277.38 kJ/mol Standard molar entropy, S o ...
In the above equation, T F is the normal freezing point of the pure solvent (273 K for water, for example); a liq is the activity of the solvent in the solution (water activity for aqueous solution); ΔH fus T F is the enthalpy change of fusion of the pure solvent at T F, which is 333.6 J/g for water at 273 K; ΔC fus p is the difference ...
At atmospheric pressure, mixtures of ethanol and water form an azeotrope at about 89.4 mol% ethanol (95.6% ethanol by mass, [83] 97% alcohol by volume), with a boiling point of 351.3 K (78.1 °C). [84] At lower pressure, the composition of the ethanol-water azeotrope shifts to more ethanol-rich mixtures. [85]
Freezing point (°C) K f (°C⋅kg/mol) Data source; Aniline: 184.3 3.69 –5.96 –5.87 K b & K f [1] ... Water: 100.00 0.512 0.00 –1.86 K b & K f [2] Ethyl ...
For pure elements or compounds, e.g. pure copper, pure water, etc. the liquidus and solidus are at the same temperature, and the term melting point may be used. There are also some mixtures which melt at a particular temperature, known as congruent melting. One example is eutectic mixture. In a eutectic system, there is particular mixing ratio ...
English: Solid - liquid phase diagram of ethanol water mixtures (melting points, freezing points) Deutsch: Fest - flüssig - Phasendiagramm von Ethanol/Wasser-Gemischen Français : Diagramme de phase solide - liquide de mélanges eau/éthanol (points de fusion, points de solidification)
Solid–liquid phase change of ethanol–water mixtures Sodium chloride and water form a eutectic mixture whose eutectic point is −21.2 °C [ 8 ] and 23.3% salt by mass. [ 9 ] The eutectic nature of salt and water is exploited when salt is spread on roads to aid snow removal , or mixed with ice to produce low temperatures (for example, in ...
Fractional freezing is a process used in process engineering and chemistry to separate substances with different melting points. It can be done by partial melting of a solid, for example in zone refining of silicon or metals, or by partial crystallization of a liquid, as in freeze distillation, also called normal freezing or progressive freezing.