CYCLOHEXANE - (110-82-7)

Introduction

Name: cyclohexane
* IUPAC
CAS Number: 110-82-7
Chemical Formula: C6H12
Molar Mass: 84.15948 g
Mass Percent: C 85.628 %; H 14.371 % 
Isomers:  1-hexene  •  cis-3-methyl-2-pentene

Classification

• organic • alkane • cycloalkane

Physical Properties


Boiling Point:*
81°C 1 = 354.15 K = 177.8°F
80°C 2 = 353.15 K = 176°F

* - 1 atm pressure

Bonding

Double Bonds: 0
Triple Bonds: 0
Sigma Bonds: 18
Pi Bonds: 0
Total: 18
Carboxyl Groups: 0
Hydroxyl Groups: 0
Hybridization: all carbons are sp3
Bonding: polar covalent
Ionic Character: 10.61 %

Thermochemistry

ΔHf° (ℓ): -37.34 kcal/mol 3 = -156.23 kJ/mol
ΔHf° (g): -29.43 kcal/mol 3 = -123.14 kJ/mol
S° (ℓ): 48.84 cal/(mol•K) 4 = 204.35 J/(mol•K)
S° (g): 71.28 cal/(mol•K) 4 = 298.24 J/(mol•K)
ΔGf° (ℓ): 6.37 kcal/mol 5 = 26.65 kJ/mol
ΔGf° (g): 7.59 kcal/mol 5 = 31.76 kJ/mol
The heat of combustion is the amount of heat released when one mole of a substance undergoes combustion according to the general reaction equation:
CxHyOz + 0.25(4x+y-2z) O2 (g) → x CO2 (g) + 0.5y H2O (ℓ)

ΔHcomb° (ℓ): -936.85 kcal = -3919.80944 kJ
ΔHcomb° (g): -944.76 kcal = -3952.90488 kJ

Safety Information

NFPA 704 Ratings:
Health: 1 - Exposure would cause irritation with only minor residual injury.
Flammability: 3 - Liquids and solids that can be ignited under almost all ambient temperature conditions. Liquids having a flash point below 23°C (73°F) and having a boiling point at or above 38°C (100°F) or having a flash point between 23°C (73°F) and 38°C (100°F).
Reactivity: 0 - Normally stable, even under fire exposure conditions, and is not reactive with water.

For More Information

Sources

(1) - Estok, George K. Organic Chemistry: A Short Text; W.B. Saunders: Philadelphia, 1959; p 29.
(2) - Shriner, Ralph L., Fuson, Reynold C., and Curtin, David Y. The Systematic Identification of Organic Compounds, 4th ed.; John Wiley & Sons: New York, 1962; p 314.
(3) - Dean, John A. Lange's Handbook of Chemistry, 12th ed.; McGraw-Hill Book Company: New York, NY, 1979; p 9:71.
(4) - Dean, John A. Lange's Handbook of Chemistry, 12th ed.; McGraw-Hill Book Company: New York, NY, 1979; p 9:71.
(5) - Dean, John A. Lange's Handbook of Chemistry, 12th ed.; McGraw-Hill Book Company: New York, NY, 1979; p 9:71.