Calculate the mass of 2.60 mol of ch3oh(l)

2.6mol x 32g/mol = 83.2g

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.