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In this section of the notes from Friday's lecture, it was said that Pentane and 2,2-Dimethylpropane have the same molecular formula, but are physically shaped differently. How is that so? I jotted the notes down really fast so after glancing over them again, I don't quite get it conceptually.
Pentane is just a string of 5 carbon molecules bonded to hydrogen atoms with single bonds. 2,2-Dimethylpropane is a string of 3 carbon atoms with two methyl groups attached to the second carbon in the chain (it looks like a + sign) with hydrogens bonded to the outer carbon atoms. The have the same molecular formula but are configured differently.
Yeah just to add on a little more, molecular formula only gives the ratio of elements in a compound. Without the full name of the compound you really wouldn't know the shape/configuration at all.
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