The energy required by electrons, present in the first Bohr orbit of hydrogen atom to be excited to second Bohr orbit is 
. Given: 
.
Text Solution
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The energy of an electron in the 
Bohr orbit of a hydrogen atom is given by 
.
The energy required for excitation from 
to 
for a single atom is
.
Given 
ergs.
Converting ergs to Joules: 
.
So, 
.
The energy required per atom is 
.
To find the energy required per mole of electrons, multiply by Avogadro's number 
.
Energy per mole 
.
Energy per mole 
.
Comparing with the given options, 
is the closest value.
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