Atomic StructureHard
Question
An amount of 1.75 × 10–4 mole of HI decomposes by the absorption of photons of wavelength 2500 Å. If one molecule is decomposed per absorbed photon, the total energy absorbed is (NA × hc = 0.12 J)
Options
A.42.0 J
B.4.2 J
C.8.4 J
D.84 J
Solution
$E = n.\frac{hc}{\lambda} = \left( 1.75 \times 10^{- 4} \times N_{A} \right) \times \frac{hc}{2500 \times 10^{- 10}} = 84\text{ J}$
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