Explanation:
The formula applied here is rydberg's equation (Bohr's equation.)
E = -Rh (1/(nf)^2 - 1/(ni)^2)
where Rh = Rydberg constant = 2.8*10^-18
1 mole = 6.02 * 10^23 particles
nf & ni stand for final & initial principal quantum numbers respectively.
your question lacks the principal quantum numbers.
