The energy emitted when electron of 1.0 g atom of hydrogen undergo transition giving the spectral li — Atomic Structure Chemistry Question

💡 Solution & Explanation

1.0 g atom of hydrogen is 1 mole of H atoms. Lowest energy visible transition is $n=3 \to 2$. Energy per atom $E = 13.6 \times \left(\frac{1}{4} - \frac{1}{9}\right) = 13.6 \times \frac{5}{36} = 1.888$ eV. Energy per mole $= 1.888 \text{ eV} \times 96.5 \text{ kJ/mol/eV} \approx 182.22$ kJ. Therefore, correct answer is D.