MAGNESIUM OXIDE - (1309-48-4)

Introduction

Name: magnesium oxide
* IUPAC
CAS Number: 1309-48-4
Chemical Formula: MgO
Molar Mass: 40.3044 g
Mass Percent: Mg 60.303 %; O 39.696 % 

Classification

• inorganic

Uses/Function

• "Because of its high melting point (2852ºC), MgO is used as a refractory material for furnace brick and wire insulation." 1

• "employed as a refractory material and as an adsorbent for water treatment" 2

• "Magnesium oxide and many other metal oxides are well known refractory materials which in general have very high melting points and have been widely used in applications where high heat resistance is required." 3

• "Magnesium oxide is a strong, lightweight refractory oxide, mildly basic in chemical properties. About 84% of it finds use in thermal and electrical inuslating materials, including refractory bricks. About 16% is used as a neutralizing agent in the chemical and pharmaceutical industries. It also finds a small use as the binder in terrazzo flooring and Sorel cement." 4

• "Basic oxides such as La2O3 and mixtures like Li2O (5% by weight) - MgO have important potential as catalysts in the oxidative coupling of methane." 5

Bonding

Bonding: ionic
Ionic Character: 64.55 %

Thermochemistry

ΔHf° (s microcrystal): -142.92 kcal/mol 6 = -597.98 kJ/mol
ΔHf° (s periclase): -143.8 kcal/mol 6 = -601.66 kJ/mol
S° (s microcrystal): 6.67 cal/(mol•K) 7 = 27.91 J/(mol•K)
S° (s periclase): 6.44 cal/(mol•K) 7 = 26.94 J/(mol•K)
ΔGf° (s microcrystal): -135.27 kcal/mol 8 = -565.97 kJ/mol
ΔGf° (s periclase): -136.0 kcal/mol 8 = -569.02 kJ/mol

Reactions

For More Information

Wikipedia
Journals:
J. B. Jago, J. Paleontol. 47, 591-592 (1973)
Harold H. Strain, Science 79, 325-326 (1934)
M. H. L. Pryce, Proc. Roy. Soc. London Ser. A 283, 433-444 (1965)
G. W. Groves and A. Kelly, Proc. Roy. Soc. London Ser. A 275, 233-244 (1963)

Sources

(1) - Silberberg, Martin S. Chemistry: The Molecular Nature of Matter and Change, 4th ed.; McGraw-Hill: New York, 2006; p 565.
(2) - Swaddle, T.W. Inorganic Chemistry; Academic Press: San Diego, 1997; p 7.
(3) - An-Lu Leu, Shao-Mu Ma, and Henry Eyring, Proc Nat Acad Sci USA 72, 1026 (1975)
(4) - Magnesium oxide. Encyclopedia of Chemical Processing and Design Marcel Dekker: New York, 1988; Vol. 28, p 463.
(5) - (a) Swaddle, T.W. Inorganic Chemistry; Academic Press: San Diego, 1997; p 123. (b) Lunsford, J.H. Angew. Chem. Int. Ed. Engl. 34, 970-980 (1995).
(6) - Dean, John A. Lange's Handbook of Chemistry, 12th ed.; McGraw-Hill Book Company: New York, NY, 1979; p 9:4-9:94.
(7) - Dean, John A. Lange's Handbook of Chemistry, 12th ed.; McGraw-Hill Book Company: New York, NY, 1979; p 9:4-9:94.
(8) - Dean, John A. Lange's Handbook of Chemistry, 12th ed.; McGraw-Hill Book Company: New York, NY, 1979; p 9:4-9:94.
(9) - Kotz, John C. and Treichel, Paul. Chemistry & Chemical Reactivity 4th ed.; Thomson Brooks/Cole: Belmont, CA, 1999; p 173.
(10) - Kotz, John C. and Treichel, Paul. Chemistry & Chemical Reactivity 4th ed.; Thomson Brooks/Cole: Belmont, CA, 1999; p 151.
(11) - Atkins, Jones, and Laverman. Chemical Principles 6th ed.; W.H. Freeman and Company: New York, NY, 2013; p F94.