Question

What is the standard enthalpy of formation of this isomer of C₈H₁₈(g)?

A) +125 kJ/mol
B) -50 kJ/mol
C) +75 kJ/mol
D) -100 kJ/mol

Answer 1

Without the specific enthalpy of formation value for the isomer of C8H18(g), it is impossible to provide an accurate answer. Reference to a table such as Appendix G with standard enthalpies of formation is necessary.

Step-by-step explanation:

The standard enthalpy of formation of an isomer of C₈H₁₈(g) would be determined based on experimental data and referenced from a table like Appendix G, which lists standard enthalpies of formation for many common substances. The values can be significantly exothermic or endothermic. For example, the standard enthalpy of formation of CO₂(g) is −393.5 kJ/mol. Since the question does not provide the specific isomer of C₈H₁₈ or access to a table with its enthalpy of formation, this cannot be accurately answered without additional data or reference material. However, it is important to note that the standard enthalpy of formation for a compound is the enthalpy change when one mole of the compound is formed from its elements under standard conditions.