|
|
|
|
|
|
 |
 |
|
The ratio of the number of ortho- to para-hydrogen molecules at equilibrium
|
|
|
|
|
|
| Organization: | National Institute of Applied Sciences and Technology |
| Department: | Chemical Engineering Department |
|
|
|
|
|
|
2006-11-09
|
|
|
|
|
|
The notebook presents the computation of ortho- to para-hydrogen molecules at equilibrium. The calculation indicates that at low temperatures and at equilibrium, the equilibrium mixture approaches 100% para-H2 while at sufficiently high temperatures the gas contains 75% ortho-H2. When a gas is frozen, we get a metastable equilibrium with 75% ortho-H2. In fact, in the absence of a catalyst, the half-life for conversion to para-H2 from ortho-H2 is very long. A plot of p-H2 versus temperature is given in the notebook. This plot is similar to Figure 4.5 page 127 in G. Nicolis, Dynamique Chimique, Thermodynamique, cinétique et mécanique statistique, Dunod, Paris 2005.
|
|
|
|
|
|
|
|
|
|
|
|
ortho- to para-hydrogen, metastable equilibrium, statistical thermodynamics, equilibrium composition in p-H2 and o-H2
|
|
|
 |
|
|
| para-ortho-H2.nb (30.1 KB) - Mathematica Notebook |
|
|
|
|
|
|
|
| | | |
| |
|
