6. From your data, find the empirical formula of the complex iron salt, KxFey(C2O4)z. nH2O using the mass percent of potassium, iron, oxalate and water.

Ithink d hope that

The problem here is that according to aufbau principle before 3d orbital 4s subshell comes.after filling 3p orbital with electrons you have 4 electrons left, you place two in 4s with opposite spin and the other two in 3d in any of its two orbitals of total five orbitals with the same spin.