User guide

V is volume (SI unit: m3)
T is the temperature (SI unit: Kelvin)
S is the entropy (SI unit: joule per Kelvin)
H is the enthalpy (SI unit: Joule)
Note: H and S are thermodynamic values found at standard temperature and pressure..
Heat of formation
Reported in KJ/mole, the heat of formation is the increase in enthalpy resulting from the formation of one mole of a sub-
stance from its constituent elements at constant pressure.
Henry’s Law constant
A unitless value, Henry's Law Constant can be expressed as:
Where ‘p’ is the partial pressure of the solute in the gas above the solution, ‘c’ is the concentration of the solute and
‘k
H,pc
’ is a constant with the dimensions of pressure divided by concentration. The constant, known as the Henry's
law constant, depends on the solute, solvent, and temperature.
Ideal gas thermal capacity
The thermal capacity at constant volume of an ideal gas is:
Where:
c
V
is a constant dependent on temperature
U is the internal energy
T is the absolute temperature
V is the volume
n is the amount of substance of the gas
R is the gas constant (8.314 J·K−1mol-1 in SI units)
N is the number of gas particles
k
B
is the Boltzmann constant (1.381×10−23J·K−1 in SI units)
The thermal capacity at constant pressure of an ideal gas is:
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