Thermodynamic equations Flashcards
What is van der waals equation
P= nRT/V-nb - a x n2/v2
Where a is the attractive force and b is the repulsive force
How do we calculate work done by the gas for expansion
W = pdv
W in J
p in pa
V in m3
how do we calculate work done by the gas for compression
W=-pdv
How do we calculate density
Density = mass/volume
How do we calculate heat transferred
Q=nCp,m dT
N - moles
Cp,m - molar heat capacity
What is the equation for electrical heating
Q=itV
Where Q is energy
I is current in amps
T is time in seconds
V is voltage in volts
How do we calculate enthalpy of sublimation
Enthalpy of sublimation = enthalpy of fusion + enthalpy of vaporisation
What is the equation for calculating the reaction enthalpy
q = n x delta H
How do we calculate entropy at a constant volume
S= nCv,m x lnTf/Ti
How do we calculate electrode potential
E = Er - El
How do we calculate useful work
Useful work = QE = -(deltaG)p,t
Where q is charge and E is potential difference
What is faradays equation
Q = nF
N number of moles
Faradays constant
What is the Gibbs phase rule equation
F=C-P+2
F- degrees of freedom
C - number of components
P - number of phases
