Why Are Bond Enthalpies Restricted to Gaseous State?

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SUMMARY

Bond enthalpies are exclusively reported for gaseous states due to the challenges in experimentally determining these values in solid or liquid states. The primary reason is that the energy required to break all bonds between specific atoms in solids or liquids is often less than the energy needed to change the state of the substance (i.e., melting or boiling). This makes it impractical to measure bond enthalpies accurately outside of gaseous conditions.

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  • Understanding of thermodynamics and enthalpy concepts
  • Familiarity with states of matter: solid, liquid, gas
  • Knowledge of bond formation and breaking processes
  • Basic principles of experimental chemistry
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Chemistry students, researchers in physical chemistry, and professionals involved in thermodynamic studies will benefit from this discussion.

Cheman
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Bond enthalpies...

Apparently from what I have read, mean bond enthalpies are only given for things in gaseous state - why is this the case? Why can we not quote bond enthalpies in, say, the solid or liquid state?

Thanks. :-D
 
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It is difficult to experimentally determine the bond enthalpies in the solid or liquid state; usually because it takes less energy to melt/boil the substance than it takes to break all bonds between specific atoms.
 
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