Multiple choice

Calculate the energy required to shift all the electrons from the 1st bohr's orbit to the fifth bohr's orbit in one mole of hydrogen ?

  1. 1259.52 kj /mol .

  2. -1259.52 kj /mol .

  3. 1230 kj / mol .

  4. -1230 kj / mol .
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A Correct answer
Explanation

This option is correct because energy is given by ,  En = -13.6 / n2 eV / atom . En -En-1 = -13.6 [ (1 / n2 ) - (1 / (n-1)2 ) ]  .  -1312 [ 1 /25 - 1] = 1259.52 kj / mol. .

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