The hatchet state deserve to be characterized as a set of conditionsthat define a person or point at a provided time. That is in thissense of words that researchers divide matter right into the 3 statesshown in the number below.

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The three claims of matter have characteristic properties. Solids have actually a distinctive shape. When they melt, the resulting fluid conforms to the form of the container. Gases increase to to fill their containers.

There space two reasons for studying gases before liquids orsolids. First, the behavior of gases is easier to describebecause most of the properties of gases do not depend on theidentity the the gas. Us can because of this develop a design for a gaswithout worrying about whether the gas is O2, N2,H2, or a mixture of these gases. Second, a relativelysimple, however powerful, model well-known as the kinetic moleculartheory is available, which explains most of the behavior ofgases.

Elements orcompounds that space Gases at Room Temperature

Before analyzing the gaianation.netical and physical nature ofgases, it can be valuable to ask: What type of facets orcompounds space gases at room temperature? To assist answer thisquestion, a list of some common compounds that room gases at roomtemperature is provided in the table below.

Common Gases in ~ Room Temperature

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Element or compound Atomic or Molecular weight
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 several patterns in the table above.

usual gases at room temperature encompass both facets (such together H2 and also O2) and compounds (such together CO2 and also NH3). elements that space gases at room temperature are all nonmetals (such as He, Ar, N2, O2, and also so on). Compounds that are gases in ~ room temperature room all covalent compounds (such as CO2, SO2, and NH3) the contain 2 or much more nonmetals. With only rare exception, these gases have relatively small molecule weights.

As a general rule, compounds that consist of reasonably light,covalent molecules are most most likely to be gases at roomtemperature.