Quantized Energy of Molecules: Minimum Energy to Break Apart

[clutch12]

Homework Statement

The graph below shows all of the quantized energies (bound states) for one of these molecules. For this molecule, E0 = -2.5 eV, E1 = -1.20 eV, E2 = -0.72 eV, and E3 = -0.30 eV. What is the minimum amount of energy required to break a molecule apart, if it is initially in the ground state? (Note that the final state must be an unbound state; the unbound states are not quantized.)

Homework Equations

Dont think i need any

The Attempt at a Solution

I honestly don't know what to do any help will be helpful

 

[CompuChip]

What does it mean that the ground state energy is negative 2.5 eV?

 

[clutch12]

oh i get it now thanks