Standard Molar Entropy

In chemistry, the standard molar entropy is the entropy content of one mole of substance, under standard conditions (not standard temperature and pressure STP).

The standard molar entropy is usually given the symbol S°, and has units of joules per mole kelvin (J mol−1 K−1). Unlike standard enthalpies of formation, the value of S° is an absolute. That is, an element in its standard state has a nonzero value of S° at room temperature. The entropy of a pure crystalline structure can be 0 J mol−1 K−1 only at 0 K, according to the third law of thermodynamics. However, this presupposes that the material forms a 'perfect crystal' without any frozen in entropy (defects, dislocations), which is never completely true because crystals always grow at a finite temperature. This residual entropy is often quite negligible.

Read more about Standard Molar EntropyThermodynamics, Chemistry, See Also

Other articles related to "standard molar entropy, entropy":

Standard Molar Entropy - See Also
... Entropy Heat Gibbs free energy Helmholtz free energy Third law of thermodynamics. ...
Silicon Tetrachloride (data Page) - Thermodynamic Properties
... C), 3.593 MPa, 0.326 dm3/mol Std enthalpy change of fusion, ΔfusHo 7.60 kJ/mol Std entropy change of fusion, ΔfusSo ? J/(mol·K) Std enthalpy change of vaporization, ΔvapHo 28.7 kJ/mol Std ...
Lutetium(III) Oxide (data Page) - Thermodynamic Properties
... change of fusionΔfusHo ? kJ/mol Std entropy change of fusionΔfusSo ? J/(mol·K) Std enthalpy change of vaporizationΔvapHo ? kJ/mol Std entropy change of vaporizationΔvapSo ? J/(mol·K ...

Famous quotes containing the words entropy and/or standard:

    Just as the constant increase of entropy is the basic law of the universe, so it is the basic law of life to be ever more highly structured and to struggle against entropy.
    Václav Havel (b. 1936)

    Where shall we look for standard English but to the words of a standard man?
    Henry David Thoreau (1817–1862)