Bottled straight-chain alkanes can be used as fuels, including heptane  and octane . Which one has the greater fuel density? By how much are the fuel values different? Give the magnitude of the difference (the absolute value).

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Bottled straight-chain alkanes can be used as fuels, including heptane  and octane .

Which one has the greater fuel density?

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

 

The image presents a table comparing the combustion enthalpy and liquid density of heptane and octane.

**Table Overview:**

1. **ΔH°_comb (kJ/mol):** 
   - Heptane: -4871.0 kJ/mol
   - Octane: -5430.0 kJ/mol

2. **Liquid Density (g/mL):**
   - Heptane: 0.655 g/mL
   - Octane: 0.703 g/mL

**Details:**
- The table is divided into two main sections, one for each substance (heptane and octane).
- Under each substance, the values for the standard enthalpy of combustion (\( \Delta H^\circ_{\text{comb}} \)) in kilojoules per mole (kJ/mol) and liquid density in grams per milliliter (g/mL) are provided.
- The negative values for \(\Delta H^\circ_{\text{comb}}\) indicate exothermic reactions, where energy is released upon combustion.
- The densities indicate the mass per unit volume of the liquid form of each substance.
Transcribed Image Text:The image presents a table comparing the combustion enthalpy and liquid density of heptane and octane. **Table Overview:** 1. **ΔH°_comb (kJ/mol):** - Heptane: -4871.0 kJ/mol - Octane: -5430.0 kJ/mol 2. **Liquid Density (g/mL):** - Heptane: 0.655 g/mL - Octane: 0.703 g/mL **Details:** - The table is divided into two main sections, one for each substance (heptane and octane). - Under each substance, the values for the standard enthalpy of combustion (\( \Delta H^\circ_{\text{comb}} \)) in kilojoules per mole (kJ/mol) and liquid density in grams per milliliter (g/mL) are provided. - The negative values for \(\Delta H^\circ_{\text{comb}}\) indicate exothermic reactions, where energy is released upon combustion. - The densities indicate the mass per unit volume of the liquid form of each substance.
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