Spell out the full name of this compound: There is a diagram of a seven-membered carbon chain, with a –CH3 group attached to the second and fourth carbons.

nomenclature of alkanes

Explination:

Substituent FormulaNumber of C AtomsName of Substituent

CH3                                   1                                         methyl–

CH3CH2                                  2                              ethyl–

CH3CH2CH2                           3                    propyl–

CH3CH2CH2CH2                       4               butyl–

CH3CH2CH2CH2CH2                     5                  pentyl–

and so forth                      and so forth     and so forth

Try this it helped me allot,

Alkenes and alkynes are named in a similar fashion. The biggest difference is that when identifying the longest carbon chain, it must contain the C–C double or triple bond. Furthermore, when numbering the main chain, the double or triple bond gets the lowest possible number. This means that there may be longer or higher-numbered substituents than would be allowed if the molecule were an alkane. For example, this molecule is 2,4-dimethylhept-3-ene (note the number and the hyphens that indicate the position of the double bond).

2,4-dimethylhept-3-ene

or two one carbonsubstituents on the second and third C atoms

its not 3-methylheptane.

number of molecules / avogadro's number * molecule molecular = mass

explanation:

we define a gram-molecular weight as the mass of one mole of any element or compound. a mole contains avogadro's number of units (molecules) –  

6.022

x

10

23

. so, dividing the number of molecules by avogadro's number gives us the number of moles. multiplying that by the molecular weight gives us the mass. from the periodic table we find the gram-molecular weight of u to be238 and of f to be19. so,  

u

f

6

will have a gram-molecular weight of 352g.

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