Question

For a particular isomer of C₈H₁₈, the combustion reaction produces 5099.5 kJ of heat per mole of C₈H₁₈. What is the isomer of C₈H₁₈?

1) Octane
2) 2,2,4-Trimethylpentane
3) 2,2-Dimethylbutane
4) 2,3-Dimethylbutane

Answer 1

The provided question asks to identify an isomer of C8H18 based on its heat of combustion. However, without specific enthalpy of combustion values for the isomers, it is not possible to definitively determine which isomer correlates with the given heat of combustion.

Step-by-step explanation:

The question is asking for the identification of an isomer of C8H18 based on the heat produced during combustion. While the question does not provide enough specific information to determine the exact isomer based solely on the heat of combustion given, in the real world, such properties can sometimes be used to differentiate between structural isomers, which may vary slightly in their combustion energies due to differences in molecular structure. Common isomers of octane include octane (n-octane), 2,2,4-trimethylpentane (isooctane), 2,2-dimethylbutane, and 2,3-dimethylbutane. However, given the information provided, it is not possible to determine which isomer is associated with the 5099.5 kJ of heat per mole without additional data such as specific enthalpy of combustion values for each isomer. Typically, one would refer to experimental values or reliable databases to closely match the heat of combustion to the isomer in question.