By how much are the fuel values different? Give the magnitude of the difference (the absolute value)

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

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.
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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