Entropy and free energy, Chemistry


Entropy (S) is a molecular 'disorder', or more precisely 'the number of microscopic arrangements of energy possible in a macroscopic sample'. Entropy depends strongly on the state and increases with rise in temperature.

Entropy changes (ΔS) are positive for reactions that generate gas molecules. The Second Law of Thermodynamics defines that the total entropy always increases in a spontaneous process, and reaches a maximum value at equilibrium. To apply this to chemical reactions it is necessary to include entropy changes in the surroundings caused by heat output or input. Both external and internal changes are taken account of by defining the Gibbs free energy change (ΔG): for a reaction performing at constant temperature.





Posted Date: 7/21/2012 8:47:35 AM | Location : United States

Related Discussions:- Entropy and free energy, Assignment Help, Ask Question on Entropy and free energy, Get Answer, Expert's Help, Entropy and free energy Discussions

Write discussion on Entropy and free energy
Your posts are moderated
Related Questions

Electronic configuration of C  is: (1) 1s 2 , 2s 2 , 2p 2 ,                               (2) 1s 2 , 2s 2 , 2p 3 (3) 1s 2 , 2s 2 ,            (4) 1s 2 , 2s 2 , 2p 6

how will you test for the presence of the halogen in iodoform?

Q. Define high spin octahedral complex? Craig showed that highly electronegative ligands tend to form spin-free complexes.  Although the valence bond theory suggests two correc

Bond-line Notation of organic compounds Occasionally, the bonds in between carbon atoms are denoted by lines. For instance, n -hexane has a continuous chain of six carbon atom

I am trying to figure out: How many H atoms are in 175 mL of 3.5 M H3PO4?

How many grams of NaCl will be produced when 2235 g of HCl are neutralized by an excess of NaOH according to the equation below? HCl + NaOH ---> H2O + NaCl

The correct ground state electronic configuration of chromium atom is: (1) [Ar] 3d 5 4s 1                (2)[Ar]3d 4 4s 2      (3) [AR]3d 6 4s 0                (4

Consider the ground state of(Z= 24)  . The numbers of electrons with the azimuthal quantum numbers,l=1   and 2 are, respectively: (1) 16 and 4          (2) 12 and 5

Q. What is Spontaneous reactions? Ans. Spontaneous reactions can occur under specific conditions without any assistance. Most of the reactions you know are spontaneous r