Question

The ionization energy of hydrogen atom is 13.6 ev. What will be the ionization energy of he+

Answer 1

Answer:

Acc. To law of conservation of mass the total mass remain constant before and after a chemical reaction .But in exothermic reaction the some amount of mass gets converted into form of energy required for the binding energy for the formation of that compound and opposite happen in endothermic. 

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Answer 2

Total energy of electron in n=2 state E

n

=

n

2

−13.6

where n=2

∴ E

2

=

2

2

−13.6

=−3.4eV

Thus potential energy of electron U

2

=2E

2

⟹ U

2

=2(−3.4)=−6.8eV