Key PointsAlkanes are saturated hydrocarbons, which means that their carbon backbones save on computer no twin or triple bonds.Due come the valence configuration of carbon, there space a selection of alkane isomers, which are frequently separated into linear and also branched structures.Alkanes are used in a number of industrial applications and are discovered in natural gas and also petroleum.

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Termssaturated hydrocarbonA link consisting entirely of hydrogen and carbon, composed totally of solitary bonds.hydrocarbonA compound consisting just of carbon and also hydrogen atoms.

Alkanes, likewise called paraffins, room a class of hydrocarbons that are fully saturated through hydrogen. Castle contain no dual or triple bonds in your carbon skeletons and, therefore, have actually the maximum variety of carbon to hydrogen covalent bonds. This is in contrast to alkenes and alkynes, which contain dual and triple bonds and are known as unsaturated hydrocarbons.

Structure of Alkanes

Alkanes have the basic formula CnH2n+2. For example, an alkane v 2 (n) carbon atoms, will have actually 6 (2n + 2) hydrogen atoms. Their nearby atoms are associated with sigma bond and kind tetrahedral centers roughly the carbon atoms. As these bonds are all solitary bonds, over there is complimentary rotation approximately all connections. Every carbon atom has four bonds (either C-H or C-C bonds), and also each hydrogen atom is join to a carbon atom (H-C bonds). A collection of connected carbon atom is recognized as the carbon skeleton or carbon backbone. The variety of carbon atoms is provided to define the size of the alkane (e.g., C2-alkane).

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The octane moleculeThe number of carbon atoms (n) in the octane molecule is 8. The number of hydrogen atoms (2n +2) is 18.

An alkyl group, typically abbreviated v the symbol R, is a functional group or side-chain that, favor an alkane, is composed solely that single-bonded carbon and also hydrogen atoms; for example, R could represent a methyl or ethyl group. An alkyl group is a piece of a molecule v the basic formula (CH3)n, where n is any type of integer. For example, a methyl team (CH3) is a fragment of a methane molecule (CH4). In this example, n=1.

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MethaneThe chemical framework of methane, a straightforward alkane.

The simplest feasible alkane is methane (CH4). Saturation oils and also waxes are examples of larger alkanes wherein the variety of carbons in the carbon backbone is greater than ten.

In linear alkanes, the carbon atoms space joined in a snake-like structure. In branched alkanes, the carbon backbone splits off in one or more directions. In cyclic alkanes, the carbon backbone is connected so together to kind a loop. Cyclic and branched alkanes will certainly be debated in greater detail in subsequent sections.

Nomenclature because that Alkanes

Alkanes are named with the suffix “-ane” adhering to the hydrocarbon prefixes. The collection contains methane (CH4), ethane (C2H6), propane (C3H8), butane (C4H10), pentane (C5H12), and so on. Because that carbon chain with size of 6, 7, 8, 9, and also 10 atoms, the prefixes room “hex-,” “hept-,” “oct-,” “non-,” and “dec-,” respectively.

For the higher molecular weight compounds, the four bonds developed by carbon permit for a number of variations ~ above the carbon skeleton. These multiple forms, i m sorry share the exact same molecular formula, are well-known as isomers. The prefix “n-,” because that normal, is reserved for the linear, unbranched develops of these alkanes .

Properties the Alkanes

The smaller sized members the the alkane household are gases, when the bigger compounds room liquid and also solid compounds. Lock are typically found in fuel sources, like natural gas and also petroleum. The heavy compounds are commonly waxy in texture.

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Alkanes have actually a variety of industrial applications past fuels, consisting of uses in cosmetics and plastics. Alkanes are usually less reactive than alkenes and also alkynes due to the fact that they lack the much more reactive dual and triple bonds. However, lock do take part in reactions through oxygen (combustion) and halogens.


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