Many hydrocarbons exist as structural isomers, which are
Chapter 18, Problem 100AP(choose chapter or problem)
Many hydrocarbons exist as structural isomers, which are compounds that have the same molecular formula but different structures. For example, both butane and isobutane have the same molecular formula of C4H10(see 12.20 on page 5.30). Calculate the mole percent of these molecules in an equilibrium mixture at 25ºC, given that the standard free energy of formation of butane is ?15.9 kJ/mol and that of isobutane is ?18.0 kJ/mol. Does your result support the notion that striaght-chain hydrocarbons (that is, hydrocarbons in which the C atoms are joined along a line) are less stable than branch-chain hydro-carbons?
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