User:Milton Beychok/Sandbox: Difference between revisions
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=== Using Riedel's method === | === Using Riedel's method === | ||
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|Octane||87.3 | |Octane||87.3 | ||
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Revision as of 12:24, 10 September 2009
Using Riedel's method
Riedel proposed an empirical equation for estimating a liquid's heat of vaporization at its normal boiling point.[1] The equation may be expressed as:[2][3]
- (3)
where: = Heat of vaporization, in J/mol = 8.3144 = Universal gas constant, in J/(K mol) = The liquid's normal boiling point, in K = The liquid's critical temperature, in K = Logarithm on base = The liquid's critical pressure at , in bar [4]
For an empirical expression, equation (3) is surprisingly accurate. For example, given
Name | Hv Tn |
---|---|
Acetone | 90.6 |
Benzene | 87.3 |
Butane | 82.3 |
Cyclohexane | 84.8 |
Octane | 87.3 |
- ↑ Riedel, Chem. Ing. Tech., 26:679, 1954
- ↑ Cite error: Invalid
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- ↑ M.M. Abbott and H.C. Van Ness (1989). Schaum's Outline of Thermodynamics With Chemical Applications, 2nd Edition. McGraw-Hill. ISBN 0-07-000042-5.
- ↑ 1 bar = 0.98692 atm