What is the volume of 2.1 moles of chlorine gas (cl2) at standard temperature and pressure (stp)?
a. 10.7 l
b. 22.4 l
c. 47.0 l
d. 82.0 l

1 mol --- 22,4 dm³
2,1 mol --- X
X = 2,1×22,4
X = 47,04 dm³ = 47,04 L

C)

C.47.0 L there you go that is the answer

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.