The potential energy minimum for Cl₂ occurs at 0.199 nm with a value of −243 kJ·mol⁻¹. At 0.300 nm, the potential energy is −50 kJ·mol⁻¹. Estimate the change in potential energy (in kJ·mol⁻¹) when the internuclear distance increases from 0.199 nm to 0.300 nm.