Question

the graph shows the potential energy of two atoms as a function of internuclear distance.
2 mark for review
what is the approximate bond energy?
a 140 kj/mol
b 170 kj/mol
c 200 kj/mol
d 270 kj/mol

Explanation:

Step1: Understand bond energy concept

Bond energy is the energy required to break a bond. On the potential - energy vs internuclear - distance graph, the bond energy is the difference between the energy at infinite separation (where atoms are not bonded, potential energy approaches a constant value) and the minimum potential energy (stable bond position).

Step2: Analyze the graph

Assume the energy at infinite separation is approximately \(0\space kJ/mol\) (as the potential energy levels off at a higher internuclear distance). We look for the minimum of the potential - energy curve. If we estimate from a standard interpretation (assuming the lowest point of the potential well is at about \(- 140\space kJ/mol\)), the bond energy \(E\) is \(|0-(- 140)|\space kJ/mol\)

Answer:

A. \(140\space kJ/mol\)