Question

An electron is moving on the third Bohr's orbit calculate the energy of the electron
En=RH 1/h^2
Given that the energy of the first Bohr orbit is
13.6eV ​

Answer 1

Answer: -2.416 J/mol

Explanation:

Energy of an electron in nth orbit is given by the formula  

En = (-13.6eV)*(Z^2)/(n^2)

Z=1 (in case of hydrogen)

n=3 (third orbit given)

Energy of the electron in third orbit = (-13.6)*(1)/(3*3) eV

   =-1.511 eV

1eV = 1.6*10^-19 (J/mol)mol

Thus En = -1.511*1.6*10^-19

= -2.416 J/mol