Molecular Formula of different Octane rating gasolines?

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SUMMARY

The discussion focuses on calculating the enthalpy of combustion for gasoline mixtures with octane ratings of 95 and 91. Participants emphasize that gasoline is a mixture rather than a single compound, complicating the determination of its molecular formula. To accurately compute the enthalpy of combustion, one must know the composition of the gasoline mixture, allowing for the calculation of a weighted average based on the individual components. This approach provides a practical workaround for determining combustion properties of these fuels.

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  • Understanding of enthalpy of combustion
  • Knowledge of gasoline composition and octane ratings
  • Familiarity with weighted averages in chemical calculations
  • Basic principles of thermodynamics
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  • Research the molecular composition of gasoline mixtures
  • Learn about the enthalpy of combustion calculations for mixtures
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Chemists, fuel researchers, and engineers involved in combustion analysis and fuel performance optimization will benefit from this discussion.

Quds Akbar
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TL;DR
Cannot find enthalpy of combustion of different gasoline mixtures because I cannot find their molecular formulas, since they are mixtures and not compounds, is there a workaround?
Trying to calculate the enthalpy of combustion for gasolines with different octane ratings, 95 and 91 gasoline in particular. The thing is, they are mixtures and not compounds. To calculate the enthalpy of combustion, I am trying to find the molecular formula for each of the gasolines, in order to work out the grams per mole. Is there a way to find the molecular formula for gasolines, or a workaround to finding the enthalpy of combustion for these different gasoline mixtures?
 
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If you know composition of the mixture, you can calculate its enthalpy of combustion as a weighted average.
 

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