An amount of mole of HI decomposes by the absorption of photons of wavelength 2500 Å. If one molecul — Atomic Structure Chemistry Question

💡 Solution & Explanation

Number of photons absorbed = Number of molecules decomposed = $1.75 \times 10^{-4} \times N_A$. Total energy $E = n \frac{hc}{\lambda} = 1.75 \times 10^{-4} \times N_A \times \frac{hc}{2500 \times 10^{-10}} = 1.75 \times 10^{-4} \times \frac{0.12}{2.5 \times 10^{-7}} = 1.75 \times 10^{-4} \times 4.8 \times 10^5 = 1.75 \times 480 = 84$ J. Therefore, correct answer is D.