Enthalpy Calculator Online (Physical Properties Calculator )

We can calculate the physical properties such as:

1. Temperature
2. Pressure
   
3. density
   
4. Enthalpy
5. Internal energy
   
6. Gibbs Free Energy
   
7. Entropy
   
8. Molecular Weight
   
9. Gas Constant
10. Heat Specific
11. Gamma
    

The temperature range 273 K to 5000 K online. you can do by clicking on the Physical Properties page on the online block in the Chemistry Index, or you can visit the web page Physical Properties Online Calculator.
For each reaction specie, the thermodynamic functions specific heat, enthalpy and entropy as functions of temperature are given in the form of least squares coefficients as follows:

Cp/R = A1 + A2T + A3T² + A4T³ + A5T⁴

H/(R*T) = A1 + A2T/2 + A3T²/3 + A4T³/4 + A5T⁴/5 + A6/T

S/R = A1lnT + A2T + A3T²/2 + A4T³/3 + A5T⁴/4 + A7

or

S/R = A1lnT + A2T + A3T²/2 + A4T³/3 + A5T⁴/4 + A7 - lnp

For each specie, two sets of coefficients are included for two adjecent temperature intervals, 273 to 1,000 [K] and 1,000 to 5,000 [K]. The data have been constrained to be equal at 1,000 [K].

Also,

U = H - p*v*MW or U = H - R*T

G = H - S*T

and

u = h - p*v or u = h - R*T/MW

g = h - s*T