Calculate the volume of 0.1m ammonia which could be obtained by the heating 2.7g of ammonia chloride with cn2 sodium hydrochloride observing all the ammonia

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.

The answer should be vaporization 

Idon't see the pic?