Chem 1B: Exam 3 Equations

S

S=klnw

ΔSuniv

ΔSuniv=ΔSsys+ΔSsurr

ΔE

ΔEsurr=-ΔEsys

ΔSsurr

ΔSsurr=-ΔHsys/T

ΔH°rxn

ΔH°rxn=(mols • ΔH°f products)-(mols • ΔH°f reactants)

ΔG°rxn

ΔG°rxn=(mols • ΔG°f products)-(mols • ΔG°f reactants)

ΔS°rxn

ΔS°rxn=(mols • ΔS°f products)-(mols • ΔS°f reactants)

ΔS°sys

ΔS°sys=ΔS°rxn

ΔG

ΔG=ΔH-TΔS

ΔSuniv

ΔSuniv=ΔS°rxn-(ΔH°rxn/T)

ΔGrxn

ΔGrxn=ΔG°rxn+RTlnQ

ΔG°rxn

ΔG°rxn=-RTlnKeq

Keq

Keq=e^(-ΔG°rxn/RT)

ΔE

ΔE=q+w

ΔG

ΔG=wmax

Keq

Keq=e^(-ΔH°/RT)•e^(ΔS°/R)

E°cell

E°cell=E°anode+E°cathode

Ecell

Ecell=-w/q

ΔG

ΔG=-qEcell

ΔG

ΔG=-nfEcell

ΔG°

ΔG°=-nfE°cell

Ecell

Ecell=E°cell-(RT/nF)lnQ

Ecell (at 25°C)

Ecell=E°cell-(0.0591/n)logQ

E°cell

E°cell=(0.0591/n)logKeq

Keq

Keq=10^(n•E°cell/0.0591)

Current Efficiency

Current Efficiency=(Actual/Expected)•100

Amperes

Amperes=1 mol e-/Second

Faraday’s Constant

Faraday’s Constant=1 mol e-=96485C