The energy needed to ionize an atom of element x when it is in its most stable state is 500 kj mol21. however, if an atom of x is in its lowest excited state, only 120 kj mol21 is needed to ionize it. what is the wavelength of the radiation emitted when an atom of x undergoes a transition from the lowest excited state to the ground state

Achemistry student needs to standardize a fresh solution of sodium hydroxide. he carefully weighs out of oxalic acid , a diprotic acid that can be purchased inexpensively in high purity, and dissolves it in of distilled water. the student then titrates the oxalic acid solution with his sodium hydroxide solution. when the titration reaches the equivalence point, the student finds he has used of sodium hydroxide solution.calculate the molarity of the student's sodium hydroxide solution. be sure your answer has the correct number of significant digits.