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The standard molar entropy at pressure = is usually given the symbol S°, and has units of joules per mole per kelvin (J⋅mol −1 ⋅K −1). Unlike standard enthalpies of formation, the value of S° is absolute. That is, an element in its standard state has a definite, nonzero value of S at room temperature. The entropy of a pure crystalline ...
Entropy (statistical thermodynamics) The concept entropy was first developed by German physicist Rudolf Clausius in the mid-nineteenth century as a thermodynamic property that predicts that certain spontaneous processes are irreversible or impossible. In statistical mechanics, entropy is formulated as a statistical property using probability ...
Absolute entropy of strontium. The solid line refers to the entropy of strontium in its normal standard state at 1 atm pressure. The dashed line refers to the entropy of strontium vapor in a non-physical state. The standard entropy change for the formation of a compound from the elements, or for any standard reaction is designated ΔS° form or ...
The table below gives thermodynamic data of liquid CO 2 in equilibrium with its vapor at various temperatures. Heat content data, heat of vaporization, and entropy values are relative to the liquid state at 0 °C temperature and 3483 kPa pressure. To convert heat values to joules per mole values, multiply by 44.095 g/mol.
Std entropy change of vaporization, Δ vap S o: 92.82 J/(mol·K) at 76 °C Solid properties Std enthalpy change of formation, Δ f H o solid? kJ/mol Standard molar entropy, S o solid? J/(mol K) Heat capacity, c p: 44.22 J/(mol K) at -227 °C (46 K) Liquid properties Std enthalpy change of formation, Δ f H o liquid –128.4 kJ/mol Standard ...
Data obtained from Lange's Handbook of Chemistry, 10th ed. and CRC Handbook of Chemistry and Physics 44th ed. The annotation, d a °C/ b °C, indicates density of solution at temperature a divided by density of pure water at temperature b known as specific gravity. When temperature b is 4 °C, density of water is 0.999972 g/mL. % wt methanol.
Vapor pressure of liquid. Table data obtained from CRC Handbook of Chemistry and Physics 44th ed. The (s) annotation indicates temperature is equilibrium of vapor over solid. Otherwise temperature is equilibrium of vapor over liquid. log10 of 1,2-dichloroethane vapor pressure. Uses formula: obtained from CHERIC [5]
Standard molar entropy, S o liquid: 151.0 J/(mol K) Enthalpy of combustion, Δ c H o liquid –1687.2 kJ/mol Heat capacity, c p: 78.99 J/(mol K) at 25 °C Gas properties Std enthalpy change of formation, Δ f H o gas: 117.1 kJ/mol Standard molar entropy, S o gas: 237.98 J/(mol K) at 101.325 kPa Enthalpy of combustion, Δ c H o gas –1112 kJ ...