Ethane molecular formula

IUPAC name l,l,l/-trichloro-2,2-bis(4-chlorophenyl) ethane Molecular formula C14H9CI5 Toxicity class USEPA II WHO II... 

Methane is the only alkane of molecular formula CH4 ethane the only one that is C2H6 and propane the only one that is C3Hj Beginning with C4H10 however constitutional isomers (Section 1 8) are possible two alkanes have this particular molecular formula In one called n butane, four carbons are joined m a continuous chain The nmn butane stands for normal and means that the carbon chain is unbranched The second isomer has a branched carbon chain and is called isobutane... 

An analogous series of hydrocarbons, and one of the simplest, are the compounds known as the alkanes. In this series, the names of all the compounds end in -ane. The first compound in this series is methane. Methane s molecular formula is CH. Methane is a gas and is the principal ingredient in the mixture of gases known as natural gas. The next compound is this series is ethane, whose molecular formula is CjHj. It is also a gas present in natural gas, although in a much lower percentage than methane. The difference in the molecular formulas of methane and ethane is one carbon and two hydrogen atoms. 

Propane is the next hydrocarbon in this series, and its molecular formula is CjHg which is one carbon and two hydrogen atoms different from ethane. Propane is an easily liquified gas which is used as fuel. 

What information is revealed by the empirical formula The molecular formula The structural formula Demonstrate, using ethane, C2Hg. 

When 0.601 gram of a sample having an empirical formula CH2O was vaporized at 200°C, and one atmosphere pressure, the volume occupied was 388 ml. This same volume was occupied by 0.301 gram of ethane under the same conditions. What is the molecular formula of CH20 ... 

CASRN 630-20-6 molecular formula C2H2CI4 FW 167.85 Chemical/Physical. The experimentally determined hydrolysis half-life of 1,1,1,2-tetrachloro-ethane in water at 25 °C and pH 7 is 46.8 yr (Jeffers et al, 1989). 

The molecular formulas just shown for 10 alkane hydrocarbon molecules represent the proportions of carbon to hydrogen in each molecule. These formulas do not reveal much about their structures, but rather indicate the proportions of each element in their molecules. Each molecule may have several different structures while still having the same formula. Molecules with different structures but the same formulas are called isomers. For example, n-butane is formed in a straight chain, but in an isomer of butane, the CH branches off in the middle of the straight chain. Another example is ethane, whose isomeric structure can be depicted as H,C H,C-CH,. The name for the normal structure sometimes uses n in front of the name. 

CHEMICAL NAME = ethane CAS NUMBER = 74-84-0 MOLECULAR FORMULA ... 

HOMOLOGOUS SERIES. Two organic compounds arc said to be homologous if their molecular formulas differ by CH . or a multiple of CH . For example, the alkane series has the general lormula. H .v, its first three members being methane. CHj. ethane. C-H(, and propane. C,Hv... 

The staggered and eclipsed forms of ethane are conformational stereoisomers (conformational isomers, conformers) because they have the same molecular formulas and sequences of bonded elements but different spatial arrangements due to rotations around single bonds. (Actually there are an infinite number of conformational isomers (also called conformations) because there are an infinite number of degrees of rotation around the bond, but normally one only needs to be concerned with energy minima and maxima.)... 

The first three members of the alkanes (methane, ethane and propane) don t have isomers. Butane, however, does have isomers and these are shown below. The first compound (1) has a longest chain of four carbons and is called n - butane but the second compound (2) has a longest chain of three carbons. But both compounds have the same molecular formula C Hjq. 

The molecular formulas for methane, ethane, and propane fit into the general molecular formula for an alkane, C H2n + i-... 

Isomerism. In the case of methane, ethane, and propane, only one structure can be written that satisfies the requirements of the parafSn class of hydrocarbons. This is not so for butane and the higher members of this series For example, two structures are possible for butane, both of which have the same molecular formula. Both formulas... 

The molecular formula of a compound shows how many atoms of each dement are present in its molecule e.g. C2IU for ethane, but this tells you nothing about how the atoms are actually linked together. It is the structural fimnula of a compound which tdls you how the atoms are joined to each other. A full structural formula is often called a graphical formula because it shows the arran ment of the atoms in space. Sometimes it is useful to represent these as a linear formula as these can be written simpfy in text on one lin eg ethane CH3CH3. 

To find the molecular formula, we must determine the molecular weight today, almost certainly by mass spectrometry, which gives an exact value (Sec. 13.2). Ethane, for example, has an empirical formula of CH3. A molecular weight of 30 is found, indicating that, of the possible molecular formulas, C2H6 must be the correct one. 

The third member of the alkane series, propane, has three carbon atoms and eight hydrogen atoms, giving it the molecular formula C3Hg. The next member, butane, has four carbon atoms in a continuous chain and the formula C4H10. Compare the structures of ethane, propane, and butane in Figure 22-3. 

Alkynes are named like the alkenes except that the suffix -yne is added to the characteristic root. The first member of the series is commonly called acetylene. Its molecular formula is C2H2. It is thermodynamically unstable, decomposing explosively to C(s) and 112(g) high pressures. It may be converted into ethene (also known as ethylene) and then to ethane by the addition of hydrogen. The condensed formulas for several small alkynes are... 

Determination of exact molecular mass -high-resolution instruments enable the molecular formula of a compound to be determined by summation of the masses of the individual isotopes of atoms, e.g. both ethane and methanal have integral... 

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