Calculate the number of milliliters of 0.544 M NaOH required to precipitate all of the Co2+ ions in 102 mL of 0.462 M CoBr2 solution as Co(OH)2. The equation for the reaction is: CoBr2(aq) + 2NaOH(aq) Co(OH)2(s) + 2NaBr(aq)

Yes i think so not 100 percent sure though

The answer is b on plato.

Ibelieve your answer is true 

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.