How many moles of ZnCl2 are produced when 0.3 moles of Zn react ? (show work) Zn + 2HCI ZnCl2 + H2

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.