ChEBI ID. the molecular formula is C8H10. Isobutane. Res. Lewis, R.J. Sr.; Hawley's Condensed Chemical Dictionary 15th Edition. Supplier Information. possible *structural formulas* which describe the way in which the The condensed formulas show hydrogen atoms right next to the carbon atoms to which they are attached, as illustrated for butane: The ultimate condensed formula is the skeletal formula (sometimes known as a line-angle formula), in which carbon atoms are implied at the corners and ends of lines, and each carbon atom is understood to be attached to enough hydrogen atoms to give each carbon atom four bonds. Anal. Isobutane is also used as a propellant for aerosol spray cans. Refrigerants are used in air-conditioning systems and freezers or refrigerators and are assigned a "R" number (by ASHRAE - formerly the American Society of Heating, Refrigerating and Air Conditioning Engineers), which is determined systematically according to their molecular structure. The condensed formulas show hydrogen atoms right next to the carbon atoms to which they are attached, as illustrated for butane: Even more abbreviated is a line-angle formula, also called a skeletal structure, in which carbon atoms are implied at the corners and ends of lines, and each carbon atom is understood to be attached to enough hydrogen atoms to give each carbon atom four bonds. The carbon atoms in the chemical structure of ISOBUTANE are implied to be located at the corner(s) and hydrogen atoms attached to carbon atoms are not indicated each carbon atom is considered to be associated with enough hydrogen atoms to provide the carbon atom with four bonds. Need to identify active compounds in your natural products? Draw line-angle formulas given structural formulas. Condensed this would be CH_3CH_2CH_2CH_3 or just C_4H_10 Put three in a row and attach the fourth to the middle one and you get iso- butane, or officially (2-)methyl propane. 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Structure of 2-methylpropane: Suggest Corrections 1 Similar questions Khim. A substance used in a thermodynamic heat pump cycle or refrigeration cycle that undergoes a phase change from a gas to a liquid and back. A structural formula shows all the carbon and hydrogen atoms and the bonds attaching them. Appl. c . 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Typical products created with isobutane are 2,4-dimethylpentane and especially 2,2,4-trimethylpentane. As the slurried polyethylene is removed, isobutane is "flashed" off, and condensed, and recycled back into the loop reactor for this purpose.[8]. We also acknowledge previous National Science Foundation support under grant numbers 1246120, 1525057, and 1413739. We use several kinds of formulas to describe organic compounds. Condensed structural chemical formulas show the hydrogen atoms (or other atoms or groups) right next to the carbon atoms to which they are attached. Find compounds which contain this structure, Find compounds which resemble this structure, European Molecular It is an isomer of butane. Join our subscribrs list to get the latest news, updates and special offers delivered directly in your inbox. Isobutane, also known as i-butane, 2-methylpropane or methylpropane, is a chemical compound with molecular formula HC(CH3)3. Res. ; Lonneman, W.A., Characterization of non-methane volatile organic compounds at swine facilities in eastern North Carolina, Atm. J. MLD 118, Revision No. It also shows the functional groups present in the molecule like amine (NH 2 ), alcohol (OH), halogens, and others. The characterisation of stationary phases and the prediction of retention indices, J. Unfortunately, structural formulas are difficult to type/write and take up a lot of space. For example, we can represent pentane (CH3CH2CH2CH2CH3) and isopentane [(CH3)2CHCH2CH3] as follows: Parentheses in condensed structural formulas indicate that the enclosed grouping of atoms is attached to the adjacent carbon atom. Skeletal ormulas imply a carbon atom at the corners and ends of lines. Provide IUPAC name of each molecule you have drawn. Chromatogr., 591, 1992, 297-301. umn class: Standard non-polar; Column diameter: 0.25 mm; Column length: 100 m; Column type: Capillary; Start T: 60 C; CAS no: 75285; Active phase: CP Sil 2; Phase thickness: 0.25 um; Data type: Kovats RI; Authors: Estel, D.; Mohnke; Biermans; Rotzsche, The analysis of C4-C11 hydrocarbons in naphtha and reformate with a new apolar fused silica column, J. Hi. This website collects cookies to deliver a better user experience. The structural formula for propane shows three axial carbon atoms and eight peripheral hydrogen atoms. Chromatogr., 7(2), 1989, 88-92. ass: Standard non-polar; Column type: Capillary; CAS no: 75285; Active phase: Methyl Silicone; Data type: Normal alkane RI; Authors: Chen, Y.; Feng, C., QSPR study on gas chromatography retention index of some organic pollutants, Comput. Which of the following structures is used to represent isobutane? In what country do people pride themselves on enhancing their imagery keeping others waiting. [Note: Shipped as a liquefied compressed gas. A molecular formula shows only the kinds and numbers of atoms in a molecule. This service is an Elixir Core Data Resource. Do not work near flamesor hot surfaces. Accessibility StatementFor more information contact us atinfo@libretexts.orgor check out our status page at https://status.libretexts.org. For example, look at the structure of n-butane and isobutane. Chromatogr. An alkane that is propane substituted by a methyl group at position 2. For example, the molecular formula C 4 H 10 tells us there are 4 carbon atoms and 10 hydrogen atoms in a molecule, but it doesn't distinguish between butane and isobutane. Isobutane Molecular Formula CH Average mass 58.122 Da Monoisotopic mass 58.078251 Da ChemSpider ID 6120 More details: Names Properties Searches Spectra Vendors Articles More Names and Synonyms Database ID (s) Validated by Experts, Validated by Users, Non-Validated, Removed by Users 1730720 [Beilstein] 201-147-5 [EINECS] 270-654-1 [EINECS] This page titled 10.1.4: Condensed Structural and Line-Angle Formulas is shared under a CC BY-NC-SA 3.0 license and was authored, remixed, and/or curated by Anonymous via source content that was edited to the style and standards of the LibreTexts platform; a detailed edit history is available upon request. Constitutional Isomers, also known as structural isomers, are connected differently and have different bonding sequences. The composition of propane can be more compactly expressed as C 3 H 8. Write condensed structural formulas for alkanes given complete structural formulas. As a refrigerant, isobutane poses a fire and explosion risk in addition to the hazards associated with non-flammable CFC refrigerants. What is the condensed structural formula of butane? Each carbon atom is understood to be attached to enough hydrogen atoms to give each carbon atom four bonds. Write the condensed structural formulas and name for all the constitutional isomers with the formula C H Br. An expanded structural formula shows all the carbon and hydrogen atoms and the bonds attaching them. ; Ramsey, J.D., Volatile Substance Abuse, UNODC Technical Series, No 5, United Nations, Office on Drugs and Crime, Vienna International Centre, PO Box 500, A-1400 Vienna, Austria, 1997, 56. ass: Standard non-polar; Column diameter: 0.20 mm; Column length: 50 m; Column type: Capillary; Heat rate: 2 K/min; Start T: 35 C; End T: 200 C; End time: 10 min; Start time: 15 min; CAS no: 75285; Active phase: PONA; Carrier gas: Nitrogen; Phase thickness: 0.50 um; Data type: Normal alkane RI; Authors: Zhang, X.; Ding, L.; Sun, Z.; Song, L.; Sun, T., Study on quantitative structure-retention relationships for hydrocarbons in FCC gasoline, Chromatographia, 70(3/4), 2009, 511-518. ass: Standard non-polar; Column type: Capillary; CAS no: 75285; Active phase: Methyl Silicone; Data type: Normal alkane RI; Authors: Spieksma, W., Determination of vapor liquid equilibrium from the Kovats retention index on dimethylsilicone using the Wilson mixing tool, J. Hi. II. We use several kinds of formulas to describe organic compounds. The following are suggested steps for drawing a line-angle structure (also known as a skeletal structure). Cyclopentane is a cycloalkane that consists of five carbons each bonded with two hydrogens above and below the plane. For physicochemical, thermodynamic, transport, spectra, and other property data & information, the followings are available from Mol-Instincts, a chemical database based on quantum chemical computations: The SMILES string of ISOBUTANE is CC(C)C, which can be can be imported by most molecule editors for conversion back into two-dimensional drawings or three-dimensional models of the ISOBUTANE. Below is an example of a more complicated molecule. 12039 Stars. ; Jacobs, P.A., On-Line Single Run Analysis of Effluents from a Fischer-Tropsch Reactor, J. Chromatogr. Complete answer: - In the question it is given to write the condensed structural formula of cyclohexane. Chromatogr., 57, 1971, 1-10. ass: Standard non-polar; Column length: 100 m; Column type: Capillary; CAS no: 75285; Active phase: PONA; Phase thickness: 0.50 um; Data type: Normal alkane RI; Authors: Perkin Elmer Instruments, Detailed hydrocarbon analysis (DHAX) Model 4015, 2002. umn class: Standard non-polar; Column length: 2.5 m; Column type: Packed; Start T: 50 C; CAS no: 75285; Active phase: Methyl Silicone; Carrier gas: Nitrogen; Substrate: Celite C-22; Data type: Normal alkane RI; Authors: Huguet, M., Kovats retention indices in the qualitative analysis of light hydrocarbons by gas chromatography, Journees internationales d'etude des methodes de separation immediate et de chromatographie, 1961, 69. ass: Standard non-polar; Column diameter: 0.22 mm; Column length: 50 m; Column type: Capillary; Heat rate: 5 K/min; Start T: 50 C; End T: 200 C; CAS no: 75285; Active phase: BP-1; Carrier gas: He; Phase thickness: 0.75 um; Data type: Normal alkane RI; Authors: Health Safety Executive, MDHS 96 Volatile organic compounds in air - Laboratory method using pumed solid sorbent tubes, solvent desorption and gas chromatography, in Methods for the Determination of Hazardous Substances (MDHS) guidance, Crown, Colegate, Norwich, 2000, 1-24. ass: Standard non-polar; Column diameter: 0.32 mm; Column length: 60 m; Column type: Capillary; Heat rate: 3 K/min; Start T: 30 C; End T: 240 C; Start time: 10 min; CAS no: 75285; Active phase: DB-1; Carrier gas: He; Phase thickness: 1.2 um; Data type: Normal alkane RI; Authors: Ciccioli, P.; Cecinato, A.; Brancaleoni, E.; Frattoni, M.; Liberti, A., Use of carbon adsorption traps combined with high resolution gas chromatography - mass spectrometry for the analysis of polar and non-polar C4-C14 hydrocarbons involved in photochemical smog formation, J. 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