Gasoline is composed primarily of hydrocarbons, including

Chapter 3, Problem 77E

(choose chapter or problem)

Gasoline is composed primarily of hydrocarbons, including many with eight carbon atoms, called octanes. One of the cleanest-burning octanes is a compound called 2,3,4-trimethylpentane, which has the following structural formula:

The complete combustion of one mole of this compound to \(\mathrm{CO}_{2}(g)\) and \(\mathrm{H}_{2} \mathrm{O}(g)\) leads to \(\Delta H^{\circ}=-5064.9\mathrm{\ kJ}/\mathrm{mol}\). (a) Write a balanced equation for the combustion of \(1 \ mol\) of \(\mathrm{C}_{8} \mathrm{H}_{18}(l)\). (b) Write a balanced equation for the formation of \(\mathrm{C}_{8} \mathrm{H}_{18}(l)\) from its elements. (c) By using the information in this problem and data in Table 5.3, calculate \(\Delta H_{f}^{\circ}\) for 2,3,4- trimethylpentane.

Equation Transcription:

Text Transcription:

CO_2 (g)

H_2 O(g)

Delta H degree = -5064.9 kJ/mol

1 mol

C_8 H_18 (l)

C_8 H_18 (l)

Delta H_f ^degree