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Energy of one mole of photons from wavelength or frequency

This type of question, asked 3 times: 14 Jun 2022, 30 Jan 2023, 31 Jan 2024. All 3 questions below, oldest first.

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  1. Question 1

    14 Jun 2022

    122
    The energy of one mole of photons of radiation of wavelength 300 nm300\text{ }nm is (Given : h=6.63×10−34Js,NA=6.02×1023 mol−1h = 6.63 \times10^{- 34}Js,N_{A}= 6.02 \times10^{23}{\text{ }mol}^{- 1}, c=3×108 ms−1c = 3 \times10^{8}{\text{ }ms}^{- 1} )

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  2. Question 2

    30 Jan 2023

    52
    The energy of one mole of photons of radiation of frequency 2×1012 Hz2 \times10^{12}\ \mathrm{Hz} in J mol−1\mathrm{J\ mol^{-1}} is ____. (Nearest integer) [Given: h=6.626×10−34Jsh = 6.626 \times10^{- 34}Js
     NA=6.022×1023 mol−1]\left. \ N_{A}= 6.022 \times10^{23}{\text{ }mol}^{- 1} \right\rbrack

  3. Question 3

    31 Jan 2024

    59
    If electromagnetic radiation of wavelength 242 nm242\text{ }nm is just sufficient to ionize a sodium atom, the ionization energy of sodium in kJ mol−1\mathrm{kJ\ mol^{-1}} is _____.