The reactants in a bath bomb were 176g at the start. 129g of sodium citrate and 14g of water are produced in the reaction. Calculate the mass of gas produced in the reaction.

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.

Ais your answer to this