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Oxygen

CAS:
7782-44-7
MF:
O2
MW:
32

Properties

Melting point:
−218 °C(lit.)
Boiling point:
−183 °C(lit.)
Density 
1.429(0℃)
vapor density 
1.11 (vs air)
vapor pressure 
>760 mmHg at 20 °C
storage temp. 
-20°C
solubility 
At 20 °C and at a pressure of 101 kPa, 1 volume dissolves in about 32 volumes of water.
form 
colorless gas
color 
Colorless gas, liquid, or hexagonal crystals
Odor
Odorless gas
Water Solubility 
one vol gas dissolves in 32 volumes H2O (20°C), in 7 volumes alcohol (20°C); soluble other organic liq, usually higher solubility than in H2O [MER06]
Merck 
13,7033
Stability:
Stable. Vigorously supports combustion. Incompatible with phosphorus, organic materials, many powdered metals.

Safety Information

Symbol(GHS) 

GHS03,GHS04
Signal word 
Danger
Hazard statements 
H270-H280
Precautionary statements 
P220-P410+P403
Hazard Codes 
O,C
Risk Statements 
8-52/53-34-48/20/22-37
Safety Statements 
17-45-36/37/39-26-61
RIDADR 
UN 1072 2.2
WGK Germany 
-
RTECS 
RS2060000
4.5-31
HazardClass 
2.2
Toxicity
OSHA recommends a minimum oxygen concentration of 19.5% for human occupancy.

Use

There are three allotropes (different forms) of oxygen: (1) atomic oxygen (O), sometimesreferred to as nascent or “newborn” oxygen; (2) diatomic oxygen (O2), or molecular oxygen(gas); and (3) ozone (O3), also a gas.The atmospheric oxygen that we breathe is a very reactive nonmetal and is colorless, odorless,and tasteless, but it is essential to all living organisms. It readily forms compounds withmost other elements. With six electrons in its outer valence shell, it easily gains two moreelectrons to form a negative (–2) ion; or as covalent, it can share electrons with other elementsto complete its outer shell.Almost all the oxygen in the atmosphere (?21%) is the allotropic form of molecular oxygen(O2). This essential gas we breathe is the result of photosynthesis, which is how green plants(with chlorophyll) use the energy of the sun to convert carbon dioxide (CO2) and water tostarches and sugars with molecular oxygen as the by-product.Liquid oxygen has a slightly bluish cast to it. As it boils, pure oxygen gas is released. Themelting point for oxygen is –218.79°C, its boiling point is –182.95°C, and its density is0.001429 g/cm3.

75 supplier list of "Oxygen"

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