ETHANE - (74-84-0)

Introduction

Name: ethane
* IUPAC
CAS Number: 74-84-0
Chemical Formula: C2H6 or CH3CH3
Molar Mass: 30.06904 g
State of Matter: colorless gas
Mass Percent: C 79.887 %; H 20.112 % 

Classification

• organic • alkane

Physical Properties

Melting Point:*
-182.8°C 1 = 90.35 K = -297.04°F
Boiling Point:*
-88°C 2 = 185.15 K = -126.4°F
-88.6°C 1 = 184.55 K = -127.48°F
Density (g/cm3):
0.5446 at -89°C 1
* - 1 atm pressure

Solubility

Qualitative:
slightly soluble:  2
soluble:  • 2
very soluble:  2

Bonding

Double Bonds: 0
Triple Bonds: 0
Sigma Bonds: 7
Pi Bonds: 0
Total: 7
Carboxyl Groups: 0
Hydroxyl Groups: 0
Hybridization: all carbons are sp3
Bonding: polar covalent
Ionic Character: 10.61 %

Thermochemistry

ΔHf° (g): -20.24 kcal/mol 3 = -84.68 kJ/mol
S° (g): 54.76 cal/(mol•K) 4 = 229.12 J/(mol•K)
ΔGf° (g): -7.84 kcal/mol 5 = -32.80 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° (g): -372.805 kcal = -1559.82584 kJ

Reactions

Safety Information

NFPA 704 Ratings:
Health: 1 - Exposure would cause irritation with only minor residual injury.
Flammability: 4 - Will rapidly or completely vaporize at normal atmospheric pressure and temperature, or is readily dispersed in air and will burn readily. Includes pyrophoric substances. Flash point below 23°C (73°F).
Reactivity: 0 - Normally stable, even under fire exposure conditions, and is not reactive with water.

For More Information

Sources

(1) - Lide, David R. CRC Handbook of Chemistry and Physics, 83rd ed.; CRC Press: Boca Raton, FL, 2002; p 3-152.
(2) - Estok, George K. Organic Chemistry: A Short Text; W.B. Saunders: Philadelphia, 1959; p 29.
(3) - Dean, John A. Lange's Handbook of Chemistry, 12th ed.; McGraw-Hill Book Company: New York, NY, 1979; p 9:77
(4) - Dean, John A. Lange's Handbook of Chemistry, 12th ed.; McGraw-Hill Book Company: New York, NY, 1979; p 9:77
(5) - Dean, John A. Lange's Handbook of Chemistry, 12th ed.; McGraw-Hill Book Company: New York, NY, 1979; p 9:77
(6) - T < 1135.16201209911
(7) - T < 5037.64109354563