Home > Uncategorized > Thermodynamics and Kinetics Lecture 14 Notes: Multi Component Systems

Thermodynamics and Kinetics Lecture 14 Notes: Multi Component Systems

Overview
Today’s lecture costs 48 minutes. As usual, it’s basically a long derivation which introduces a new subject.

Details
dG = -SdT + Vdp
S = (dG/dT)p
V = (dG/dp)T
G = H-TS

For ideal gases,
G bar =G ss(t,p ) + RT ln (p2/p1)

G/n=u=chemical potential

H2 + Cl2 = 2HCl has 3 species. 2H2 + O2 = 2H2O has a phase change and a change in the number of moles.

G=H-TS=-RT lnK = -nFE

A cell in water will burst. Water goes from high chemical potential to low u. The same thing will happen if you stick a fish in fresh water rather than salt water.

G (T, p, n1, n2). There are two components in this system.

u=(dG/dni) scales with the size of the system. u is an intensive property.

dG = -s dT + vdp + ui dni

H2O (s) to H2O (l)
If the chemical potential of mixing is less than that of a pure substance, than it will go into solution. Most of the time, it’s an entropy driven process.

Review
Colligative properties: osmotic pressure, vapor pressure decrease, boiling point elevation, freezing point depression

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