Bond Enthalpy

Question 1

Define the term bond enthalpy

Answer 1

enthalpy change to break one mole of covalent bonds with all species in the gaseous state

Question 2

Why is an average mean bond enthalpy used?

Answer 2

bonds may have slightly different bond enthalpies in different molecules

Question 3

What is the equation for bond enthalpy?

Answer 3

(sum of bonds broken)-(sum of bonds made)

Question 4

How do we find the values needed for the bond enthalpy equation?

Answer 4

1. draw displayed formula of molecules to show all bonds
2. count number of bonds broken (reactants side) and add together
3. count number of bonds made (products side) and add together
4. use bond enthalpy equation