The energy required by electrons, present in the first Bohr orbit of hydrogen atom to be excited to

Question

The energy required by electrons, present in the first Bohr orbit of hydrogen atom to be excited to second Bohr orbit is $\_\_\_\_$ $\mathrm{J} \mathrm{mol}^{-1}$. 
Given: $R_H=2.18 	imes 10^{-11} \mathrm{ergs}$.

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