1. The problem statement, all variables and given/known data A hydrogen chloride molecule may be modeled as a hydrogen atom (mass: 1.67 x10^-27 kg ) on a spring; the other end of the spring is attached to a rigid wall (the massive chlorine atom). If the minimum photon energy that will promote this molecule to its first excited state is 0.358 eV, find the "spring constant." I'm not sure which equation to use. is it E=1/2kA^2? If so, what would the value of A be? Thank you for your help!