What electronic transition in a hydrogen atom starting from n=7 energy level will produce infrared radiation with energy of 55.1 kj/mol?

(n = 7) ⟶ (n = 4)

Explanation:

1. Convert the energy to joules per mole of electrons.  

E = 55.1 × 1000 = 55 100 J/mol

2. Convert the energy to joules per electron

E = 55 100/(6.022 × 10²³)

E = 9.150 × 10⁻²⁰ J/electron

3. Use the Rydberg equation to calculate the transition

Rydberg's original formula was in terms of wavelengths, but we can rewrite it to have the units of energy. The formula then becomes  

where  

= the Rydberg constant = 2.178 × 10⁻¹⁸ J

and are the initial and final energy levels.

nacl is added to the aqueous of what? ? in order to get a proper answer you have to specify the exact composition of the aqueous solution.

the answer is definitely c.