If 6.0g of glucose are dissolved in 1.61x10^2 ml of solution, what is the molarity

Molar mass glucose = 180.15 g/mol

number of moles:

1 mole 180.15 g
? moles 6.0 g

6.0 x 1 / 180.15 => 0.0333 moles

Volume in liters:

1.61x10² mL / 1000 => 0.161 L

Therefore:

M = n / V

M =  0.0333 / 0.161

M = 0.206 mol/L

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.