Portmess Homework Solutions 45

Portmess Homework Solutions 45 - ( c ) Isopentane and...

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Unformatted text preview: ( c ) Isopentane and neopentane each have fewer carbons than 2-methylpentane, which therefore has the greatest heat of combustion. Neopentane is more highly branched than isopentane; neopentane has the lowest heat of combustion. Neopentane (CH 3 ) 4 C Heat of combustion 3514 kJ/mol (839.9 kcal/mol) Isopentane (CH 3 ) 2 CHCH 2 CH 3 Heat of combustion 3529 kJ/mol (843.4 kcal/mol) 2-Methylpentane (CH 3 ) 2 CHCH 2 CH 2 CH 3 Heat of combustion 4157 kJ/mol (993.6 kcal/mol) ( d ) Chain branching has a small effect on heat of combustion; the number of carbons has a much larger effect. The alkane with the most carbons in this group is 3,3-dimethylpentane; it has the greatest heat of combustion. Pentane has the fewest carbons in this group and has the smallest heat of combustion. Pentane CH 3 CH 2 CH 2 CH 2 CH 3 Heat of combustion 3527 kJ/mol (845.3 kcal/mol) 3-Methylpentane (CH 3 CH 2 ) 2 CHCH 3 Heat of combustion 4159 kJ/mol (994.1 kcal/mol) 3,3-Dimethylpentane (CH 3 CH 2 ) 2 C(CH 3 ) 2 Heat of combustion...
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