Physical Properties of Hydrogen

03 Apr, 2010 chemistry

Hydr0gen is the lightest element in the universe! It is also the most abundant element in the universe. This post will tell you some of the physical properties of hydrogen. For more information on hydrogen see the links at the bottom of the post.

Physical Properties of Hydrogen

Atomic Weight: 1.00794 g/mol
Colorless, tasteless, odorless and extremely flammable.
State at Room Temperature: Gas
Density (at standard temperature and pressure): 0.08988 g/L
Melting Point/Freezing Point: 14.01K, -259.14C, -434.45F
Triple Point: 13.8033K (-259C) and 7.042 KPa pressure. The triple point is the temperature and pressure where all three phases (solid, liquid and gas) of an element coexist.
Enthalpy of Fusion: 0.117 kJ/mol (this is for the element H2- halve for just one atom of hydrogen)
Enthalpy of Vaporisation: 0.904 kJ/mol (for H2)
Specific Heat Capacity (at 25C): 28.836 J/molK.
Boiling Point: 20.28K, -252.87C, -423.17F
Automatic Ignition Temperature: 773K, 500C, 932F
Flash Point (theoretical only- not observed): 20K, -253C, -423F
Very poor conductor of electricity
Enthalpy of Atomization (at 25C): 217.6 kJ/mol