Standard Entropy Of Liquid Water

Increase in entropy during vaporization of a liquid

In thermodynamics, the entropy of vaporization is the increase in entropy upon vaporization of a liquid. This is ever positive, since the degree of disorder increases in the transition from a liquid in a relatively small book to a vapor or gas occupying a much larger space. At standard pressure level ${\displaystyle P^{\ominus }}$ = 1 bar, the value is denoted as ${\displaystyle \Delta S_{\text{vap}}^{\ominus }}$ and normally expressed in joules per mole-kelvin, J/(mol·Grand).

For a phase transition such as vaporization or fusion (melting), both phases may coexist in equilibrium at abiding temperature and pressure level, in which case the difference in Gibbs complimentary free energy is equal to nada:^[1]

${\displaystyle \Delta G_{\text{vap}}=\Delta H_{\text{vap}}-T_{\text{vap}}\times \Delta S_{\text{vap}}=0,}$

where ${\displaystyle \Delta H_{\text{vap}}}$ is the heat or enthalpy of vaporization. Since this is a thermodynamic equation, the symbol ${\displaystyle T}$ refers to the absolute thermodynamic temperature, measured in kelvins (K). The entropy of vaporization is then equal to the estrus of vaporization divided by the boiling point:^{[ii] [3]}

${\displaystyle \Delta S_{\text{vap}}={\frac {\Delta H_{\text{vap}}}{T_{\text{vap}}}}.}$

According to Trouton'southward dominion, the entropy of vaporization (at standard pressure level) of most liquids has similar values. The typical value is variously given as 85 J/(mol·Yard),^[3] 88 J/(mol·G)^[4] and ninety J/(mol·K).^[1] Hydrogen-bonded liquids have somewhat higher values of ${\displaystyle \Delta S_{\text{vap}}^{\ominus }.}$ ^[4]

See also [edit]

• Entropy of fusion

References [edit]

1. ^ ^{a b} Engel, Thomas; Reid, Philip (2006). Physical Chemistry. Pearson Benjamin Cummings. pp. 178–ix. ISBN0-8053-3842-10.
2. ^ Laidler, Keith J.; Meiser, John H. (1982). Physical Chemistry. Benjamin/Cummings. p. 100. ISBN0-8053-5682-7.
3. ^ ^{a b} Atkins, Peter; de Paula, Julio (2006). Atkins' Physical Chemistry (8th ed.). Us: Oxford Academy Press. pp. 88–89. ISBN0-7167-8759-8.
4. ^ ^{a b} Laidler, Keith J.; Meiser, John H. (1982). Concrete Chemistry. Benjamin/Cummings. pp. 176–177. ISBN0-8053-5682-7.

Standard Entropy Of Liquid Water,

Source: https://en.wikipedia.org/wiki/Entropy_of_vaporization

Posted by: alexanderspled1975.blogspot.com

Share this post