The ax state deserve to be characterized as a collection of conditionsthat describe a human being or point at a offered time. It is in thissense of words that scientists divide matter into the three statesshown in the number below.




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The three says of matter have characteristic properties. Solids have actually a distinct shape. As soon as they melt, the resulting liquid conforms come the form of that container. Gases broaden to fill their containers.

There room two factors for studying gases prior to liquids orsolids. First, the habits of gases is much easier to describebecause most of the properties of gases do not rely on theidentity the the gas. Us can thus develop a model for a gaswithout worrying about whether the gas is O2, N2,H2, or a mixture of these gases. Second, a relativelysimple, yet powerful, model recognized as the kinetic moleculartheory is available, which explains most of the behavior ofgases.

Elements orcompounds that space Gases at Room Temperature

Before assessing the rebab.netical and physical nature ofgases, it could be beneficial to ask: What type of facets orcompounds room gases at room temperature? To aid answer thisquestion, a perform of some typical compounds that are gases in ~ roomtemperature is offered in the table below.

Common Gases at Room Temperature




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Element or link Atomic or Molecular load
H2 (hydrogen) 2.02
He (helium) 4.00
CH4 (methane) 16.04
NH3 (ammonia) 17.03
Ne (neon) 20.18
HCN (hydrogen cyanide) 27.03
CO (carbon monoxide) 28.01
N2 (nitrogen) 28.01
NO (nitrogen oxide) 30.01
C2H6 (ethane) 30.07
O2 (oxygen) 32.00
PH3 (phosphine) 34.00
H2S (hydrogen sulfide) 34.08
HCl (hydrogen chloride) 36.46
F2 (fluorine) 38.00
Ar (argon) 39.95
CO2 (carbon dioxide) 44.01
N2O (dinitrogen oxide) 44.01
C3H8 (propane) 44.10
NO2 (nitrogen dioxide) 46.01
O3 (ozone) 48.00
C4H10 (butane) 58.12
SO2 (sulfur dioxide) 64.06
BF3 (boron trifluoride) 67.80
Cl2 (chlorine) 70.91
Kr (krypton) 83.80
CF2Cl2 (dichlorodifluoromethane) 120.91
SF6 (sulfur hexafluoride) 146.05
Xe (xenon) 131.30

There are numerous patterns in the table above.

common gases in ~ room temperature encompass both elements (such together H2 and also O2) and also compounds (such together CO2 and NH3). facets that room gases in ~ room temperature room all nonmetals (such together He, Ar, N2, O2, and so on). Compound that space gases in ~ room temperature space all covalent compounds (such as CO2, SO2, and also NH3) the contain 2 or an ext nonmetals. With just rare exception, this gases have relatively small molecular weights.

As a basic rule, compounds the consist of fairly light,covalent molecules room most likely to be gases at roomtemperature.