What is the wavelength in nanometers of the spectral line for hydrogen when an electron transitions from n_f = 5 to n_i = 2 using the Balmer equation? What is the energy of the radiation corresponding to this line in kilojoules per mole?

• A. λ = 434 nm; E = 276 kJ/mol
• B. λ = 2.30×10⁻³ nm; E = 5.20×10⁷ kJ/mol
• C. λ = 434 nm; E = 276 kJ/mol; E = 4.58×10⁻²⁸ kJ/mol
• D. λ = 2.30×10⁻³ nm; E = 3.63×10⁻³ kJ/mol

Answer: (A)