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Question

Calculate energy of one mole of photons of radiation whose frequency as 5 × 1014Hz.


A

199.51 KJ

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B

299.31 KJ

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C

399.31 KJ

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D

499.31 KJ

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Solution

The correct option is A

199.51 KJ


One thing we have to keep in mind here.

1 mole = 6.022 × 1023

Now E = hν

= (6.626 × {10}^{-34} Js) (5 × 1014 s1)

= (3.313 × 1019)

Energy of one mole of photons

= (3.313 × 1019 J)(6.022 × 1023 mol1)

= 199.51 KJ mol1


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