Chapter 2 : Alkanes

Qu 1 : Draw the constitutional isomers of C₆H₁₄.

Qu 2 : Draw the constitutional isomers of C₅H₁₀.

Qu 3 : Draw the constitutional isomers of C₃H₆O.
 

Thermodynamics Questions
 

Qu 4 :

Gasoline mainly consists of two isomers of octane:  I = 2,2-dimethylhexane, ΔHc = -1304.6 kcal/mol and,  II =  2,2,3,3-tetramethylbutane, ΔHc = -1303.0 kcal/mol.  Knowing that the heats of combustion, ΔHc C (graphite) = -94.05 kcal/mol and ΔHc H2 (gas) = -57.8 kcal/mol, calculate the heat of formation, ΔHf for each of  the isomers of octane. Based on this data, which isomer is the most stable ?  Is this consistent with what you would have predicted ?

Answers ?

© Dr. Ian Hunt, Department of Chemistry