what is bond enthalpy ? (3 marks)

Asked by greatnalin | 6th Apr, 2011, 12:00: AM

Expert Answer:

Dear Student
 

The Bond Enthalpy is the energy required to break a chemical bond. It is usually expressed in units of kJ mol-1, measured at 298 K.

The exact bond enthalpy of a chemical bond depends upon the molecular environment in which the bond exists. Therefore, bond enthalpy values given in chemical data books are averaged values.

Bond breaking is an endothermic process, and the bond enthalpy involved is given a +ve sign. Bond making is an exothermic process. For the formation of a given chemical bond, the bond enthalpy has the same value, except it is given a -ve sign.

We hope that clarifies your query.
Regards
Team
Topperlearning

Answered by  | 6th Apr, 2011, 10:29: AM

Queries asked on Sunday & after 7pm from Monday to Saturday will be answered after 12pm the next working day.