Handout 3 Flashcards
State two fundamental thermodynamic equations
dU=TdS=pdV
dG=Vdp-SdT
What is Gibbs energy pressure equation?
Gm(p)=G(standard)m+RTlnp/p(standard)
What is the relationship between dG and dw?
dG=dwrev(star) i.e- non-expansion work= dw(max)
What is deltaHmix for an ideal gas?
equals 0
What is the expression for delta G for a mixture of gases? How is this different from delta S expression?
=nRTsum(xi)ln(xi)
It includes an extra term T to account for temperature.
What is delta G mix for all compositions?
less than 0
What is the expression for gibbs energy in terms on mole fractions?
G=nAmu+nBmu
where mu is chemical potential
What is equation for single component for mu?
mu=mu(standard)+RTlnp/p(standard)
What is the equation for two components for mu?
deltarG=deltarG(standard)+RTlnpartial pressures (B/A). Where the deltarG (standard) = muB-muA
What is the equation for delta G at equilibrium?
deltarG=-RTlnK
What is the LeChatelier relationship?
K/ptot=xB/xA
for A equibibrating with B
What is van’t hoff equation?
lnK2/K1=-deltarH(standard)/R[1/T2-1/T1]
How do we measure gibbs energy if ions?
define gibbs standard, enthalpy standard, entropy standard for formation for one substance (usually H+) as 0. Allows product, reactant relationship to be used to get delta r quantities.
