Question

pls answer this question

Answer 1

$\huge\mathcal{\boxed{\fcolorbox{lime}{orange}{SOLUTION;-}}}$

☃️ The energy of electron in Bohr's model is directly proportional to Z²/n² .

☃️ Therefore the energy of electron in 3nd orbit of He+ is 4 times the energy of electron in 3nd orbit of Hydrogen .

$\bf{\color{aqua}\implies}$ Energy of the third orbit of H-atom is '-4x kJ/mol' .

[Note → Bohr's model can be applied to single electrons system only .]

We know that,

$\sf\pink{\implies\:Energy\:(E)\:\propto\:\dfrac{Z^2}{n^2}\:}$

• Here, Z is same for second orbit of H-atom & third orbit of H-atom .

$\sf{\implies\:\dfrac{E_2}{E_3}\:=\:\dfrac{n^2_3}{n^2_2}\:}$

$\sf{\implies\:\dfrac{E_2}{-4x}\:=\:\dfrac{3^2}{2^2}\:}$

$\sf{\implies\:E_2\:=\:\dfrac{9}{4}\times{-4x}\:}$

$\sf\red{\implies\:E_2\:=\:-9x\:KJ.mol^{-1}}$

∴ The energy of second orbit of H-atom will be '-9x KJ/mol' .

Answer 2

Answer:

please refer this aatachment

Explanation: