An amount of 1.75 × 10–4 mole of HI decomposes by the absorption of photons of wavelength 2500 Å. If

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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)

Accepted Answer

$E = n.\frac{hc}{\lambda} = \left( 1.75 	imes 10^{- 4} 	imes N_{A} ight) 	imes \frac{hc}{2500 	imes 10^{- 10}} = 84	ext{ J}$

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