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NCERT Class XI Chemistry Structure of Atom Solutions

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Question : 14
Total: 67
How much energy is required to ionise a H atom if the electron occupies n = 5 orbit? Compare your answer with the ionisation enthalpy of H atom (energy required to remove the electron from n = 1 orbit)
Solution:  
En =
13.12×105
n2
 J/mole
Energy required to remove the electron completely from n = 5 orbital in an H-atom is =
13.12×105
52
 J/mole = 0.5248 × 105 J/mole= 5.248 × 104 J/mole
=
5.248×104
6.022×1023
 = 8.71 × 10−20 J/atoms
Energy required to remove the electron completely from n = 1 orbit in a H-atom is =
13.12×105
12
 J/mol = 13.12 × 105 J/mol
=
13.12×105
6.022×1023
 = 2.17 × 10−18 J/atom
∴ Energy required to remove the electron from n = 1 orbit is 25 times than that required to remove the electron from n = 5.
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