Predicting the Sign of for Phase Changes - Edubirdie

University:
College
Course:
College Chemistry
Academic year:

2023
Views:

423

Pages:

1
Author:

W. Roy

Predicting the sign of As for Phase Changes: At a given T, sgas/vapour >> Siquid > Ssolid Fusion; Solid liquid AS fUS SIM-S501 (+) Varoonzation; Liquid vapour AS wap Suop-sliq (+) Condensation; Vapour Liquid AS Core: Slig - SuaP (-) Both As Fus & As vap have (t) values. As cond has a value. The Secound Law of Thermodynamics *Law answers the question " is the sign of A the true criteria for spontaneous change?" * There are several State ments for the second Law. Exama (s) + Cl₂ (9) 2 Mac(s) ΔΓΗ°=-822K)/md AS Systom = 25 Naci (5) - [25 Na(S)+SC2(9)] SC cgs will have a much higher Valve we Predict the Sign to be negatife but reaction is Spontaneous. Statement of the Second Law: All spontaneous Processes Produce an increase in the entropy of the universe. As univ = As systt As surr As univ is (t); spontaneous Forward non spontaneous in reverse As univ is (-); Spontaneous revense. Non spontaneous in forward. *unlike energy, entropy is not conserved in a spontaneous Process The entropy of the universe is always increasing.

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