Question

what is the chemical composition of oxygen​

Answer 1

Answer:

Nitrogen — 78 percent. Oxygen — 21 percent. Argon — 0.93 percent. Carbon dioxide — 0.04 percent.

Explanation:

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Answer 2

Answer:

Nitrogen — 78 percent. Oxygen — 21 percent. Argon — 0.93 percent. Carbon dioxide — 0.04 percent.

Explanation:

Oxygen is the chemical element with the symbol O and atomic number 8. It is a member of the chalcogen group in the periodic table, a highly reactive nonmetal, and an oxidizing agent that readily forms oxides with most elements as well as with other compounds. After hydrogen and helium, oxygen is the third-most abundant element in the universe by mass. At standard temperature and pressure, two atoms of the element bind to form dioxygen, a colorless and odorless diatomic gas with the formula O

2. Diatomic oxygen gas constitutes 20.95% of the Earth's atmosphere. Oxygen makes up almost half of the Earth's crust in the form of oxides.[2]

Oxygen

Allotropes

O2, O3 (ozone)

Appearance

gas: colorless

liquid and solid: pale blue

Standard atomic weight Ar, std(O)

[15.99903, 15.99977] conventional: 15.999

Physical properties

Phase at STP

gas

Melting point

(O2) 54.36 K (−218.79 °C, −361.82 °F)

Boiling point

(O2) 90.188 K (−182.962 °C, −297.332 °F)

Density (at STP)

1.429 g/L

when liquid (at b.p.)

1.141 g/cm3

Triple point

54.361 K, 0.1463 kPa

Critical point

154.581 K, 5.043 MPa

Heat of fusion

(O2) 0.444 kJ/mol

Heat of vaporization

(O2) 6.82 kJ/mol

Molar heat capacity

(O2) 29.378 J/(mol·K)

Other properties

Natural occurrence

primordial

Crystal structure

cubicCubic crystal structure for oxygen

Speed of sound

330 m/s (gas, at 27 °C)

Thermal conductivity

26.58×10−3 W/(m·K)

Magnetic ordering

paramagnetic

Magnetic susceptibility

+3449.0·10−6 cm3/mol (293 K)[1]

CAS Number

7782-44-7

History

Discovery

Carl Wilhelm Scheele (1771)

Named by

Antoine Lavoisier (1777)

Oxygen was isolated by Michael Sendivogius before 1604, but it is commonly believed that the element was discovered independently by Carl Wilhelm Scheele, in Uppsala, in 1773 or earlier, and Joseph Priestley in Wiltshire, in 1774. Priority is often given for Priestley because his work was published first. Priestley, however, called oxygen "dephlogisticated air", and did not recognize it as a chemical element. The name oxygen was coined in 1777 by Antoine Lavoisier, who first recognized oxygen as a chemical element and correctly characterized the role it plays in combustion.

Common uses of oxygen include production of steel, plastics and textiles, brazing, welding and cutting of steels and other metals, rocket propellant, oxygen therapy, and life support systems in aircraft, submarines, spaceflight and diving.

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