MERCURY(II) OXIDE - (21908-53-2)

Introduction

Name: mercury(II) oxide
* IUPAC
CAS Number: 21908-53-2
Chemical Formula: HgO
Molar Mass: 216.5894 g
Mass Percent: Hg 92.613 %; O 7.3869 % 

Classification

• inorganic

Bonding

Bonding: polar covalent
Ionic Character: 46.67 %

Thermochemistry

ΔHf° (s red orthorhombic): -21.71 kcal/mol 1 = -90.83 kJ/mol
ΔHf° (s yellow): -21.62 kcal/mol 1 = -90.46 kJ/mol
ΔHf° (s red hexagonal): -21.4 kcal/mol 1 = -89.54 kJ/mol
S° (s red orthorhombic): 16.80 cal/(mol•K) 2 = 70.29 J/(mol•K)
S° (s yellow): 17.0 cal/(mol•K) 2 = 71.13 J/(mol•K)
S° (s red hexagonal): 17.0 cal/(mol•K) 2 = 71.13 J/(mol•K)
ΔGf° (s red orthorhombic): -13.995 kcal/mol 3 = -58.56 kJ/mol
ΔGf° (s yellow): -13.964 kcal/mol 3 = -58.43 kJ/mol
ΔGf° (s red hexagonal): -13.92 kcal/mol 3 = -58.24 kJ/mol

Reactions

Safety Information

NFPA 704 Ratings:
Health: 3 - Short exposure could cause serious temporary or moderate residual injury.
Flammability: 1 - Must be heated before ignition can occur. Flash point over 93°C (200°F).
Reactivity: 0 - Normally stable, even under fire exposure conditions, and is not reactive with water.

For More Information

Sources

(1) - Dean, John A. Lange's Handbook of Chemistry, 12th ed.; McGraw-Hill Book Company: New York, NY, 1979; p 9:4-9:94.
(2) - Dean, John A. Lange's Handbook of Chemistry, 12th ed.; McGraw-Hill Book Company: New York, NY, 1979; p 9:4-9:94.
(3) - Dean, John A. Lange's Handbook of Chemistry, 12th ed.; McGraw-Hill Book Company: New York, NY, 1979; p 9:4-9:94.
(4) - Ebbing, Darrell D. General Chemistry 3rd ed.; Houghton Mifflin Company: Boston, MA, 1990; p 74.