Bond enthalpies

Mean bond enthalpy.

Students should be able to:

• define the term mean bond enthalpy

• use mean bond enthalpies to calculate an approximate value of ∆H for reactions in the gaseous phase

• explain why values from mean bond enthalpy calculations differ from those determined using Hess’s law.

MS 1.2

Students understand that bond enthalpies are mean values across a range of compounds containing that bond.