Aluminum, Elemental

CAS RN:7429-90-5

Other Properties

...Capable of taking brilliant polish which is retained in dry air. In moist air, oxide film forms which protects metal from corrosion. ...Does not vaporize even at high temperatures, but finely divided aluminum dust is easily ignited, and may cause explosions. Reacts with dilute HCl, H2SO4, KOH and NaOH with evolution of hydrogen. Reduces the cations of many heavy metals to the metallic state E(o)(aq) Al+3/Al -1.66V.

Good conductor of heat and electricity

Tensile strength (annealed) 6800 psi, cold rolled 16,000 psi; rapidly oxidized by water at 180 deg C. ... Electrical conductivity approximately two-thirds that of copper. Aluminum qualifies as both a light metal and a heavy metal, according to their definitions.

Ionic radius = 57 pm. In combination with its high oxidation potential +1.66V and the +3 oxidation state, the ionic radius accounts for the stability of aluminum compounds.

Heat of formation: 0.0 (crystalline); 330.0 (gas) kJ/mol @ 298.15 K; Gibbs energy of formation: 289.4 (gas) kJ/mol @ 298.15 K; standard molar entropy: 28.3 (crystalline) J/mol K @ 298.15 K; 164.6 (gas) J/mol K @ 298.15 K; molar heat capacity at constant pressure: 24.4 (crystalline) J/mol K @ 298.15 K; 21.4 (gas) J/mol K @ 298.15 K

Enthalpy of fusion: 10.71 kJ/mol @ MP

Enthalpy of vaporization: 143.9 kJ/mol @ BP

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