heat of vaporization

Other Definitions
heat of vaporization (dict)

The heat of vaporization is a physical property of substances. It is defined as the heat required to vaporize one mole of a substance at its boiling point under standard pressure (101325 Pa). The heat of vaporization is expressed in kJ/mol. The use of kJ/kg is also possible, but less customary. Because vaporization is the opposite process of condensation, the term heat of condensation is also used. The latter is defined as the heat released when one mole of the substance condenses at its boiling point under standard pressure. The heat of vaporization of water is about 2260 kJ/kg which is equal to 40.8 kJ/mol. This is quite a lot: five times the energy needed for heating the water from 0 to 100 degrees Celsius.

Heats of vaporization of the elements

Element	Heat of vaporization (kJ/mol)
Actinium	n/a
Aluminium	293.4
Antimony	77.14
Argon	6.447
Arsenic	34.76
Astatine	114
Barium	142
Beryllium	292.40
Bismuth	104.8
Boron	489.7
Bromine	15.438
Cadmium	100
Caesium	67.74
Calcium	153.6
Carbon	355.8
Cerium	414
Chlorine	10.2
Chromium	344.3
Cobalt	376.5
Copper	300.3
Fluorine	3.2698
Gallium	258.7
Germanium	330.9
Gold	334.4
Hafnium	575
Helium	0.0845

Element	Heat of vaporization (kJ/mol)
Hydrogen	0.44936
Indium	231.5
Iodine	20.752
Iridium	604
Iron	349.6
Krypton	9.029
Lanthanum	414
Lead	177.7
Lithium	145.92
Magnesium	127.4
Manganese	226
Mercury	59.229
Molybdenum	598
Neon	1.7326
Neptunium	n/a
Nickel	370.4
Niobium	696.6
Nitrogen	2.7928
Osmium	627.6
Oxygen	3.4099
Palladium	357
Phosphorus	12.129
Platinum	510
Polonium	60.1
Potassium	79.87
Radium	37

Element	Heat of vaporization (kJ/mol)
Radon	16.4
Rhenium	715
Rhodium	493
Rubidium	72.216
Ruthenium	595
Scandium	314.2
Selenium	26.3
Silicon	384.22
Silver	250.58
Sodium	96.96
Strontium	144
Sulfur	1.7175
Tantalum	743
Technetium	660
Tellurium	52.55
Thallium	164.1
Thorium	514.4
Tin	295.8
Titanium	421
Tungsten	824
Vanadium	452
Xenon	12.636
Yttrium	363
Zinc	115.3
Zirconium	58.2

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