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Chemistry
10th Edition
ISBN: 9781305957404
Author: Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher: Cengage Learning
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By how much are the fuel values different? Give the magnitude of the difference (the absolute value)

Transcribed Image Text:Bottled straight-chain alkanes can be used as fuels, including heptane and octane.
| Property | Heptane | Octane |
|------------------------------|---------------|--------------|
| ΔH°<sub>comb</sub> (kJ/mol) | -4871.0 | -5430.0 |
| Liquid Density (g/mL) | 0.655 | 0.703 |
This table presents the combustion enthalpy and liquid densities of heptane and octane, which are both straight-chain alkanes. The combustion enthalpy (ΔH°<sub>comb</sub>) is shown in kilojoules per mole (kJ/mol) and indicates the energy released during combustion. Octane releases more energy than heptane with a value of -5430.0 kJ/mol compared to -4871.0 kJ/mol. The liquid density of octane is higher at 0.703 g/mL compared to heptane's 0.655 g/mL, suggesting that octane is denser than heptane.
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