What is the percent by mass of carbon10 hydrogen 14 nitrogen 2

We are given with the components carbon, hydrogen and nitrogen. I believe the numbers are the number of moles of each element. we convert each number of mole to mass by multiplying by their respective molar weights. Carbon has 120 grams, hydrogen has 14 grams and nitrogen has 28 grams. The total is 162 grams. Carbon is 74.07 percent, hydrogen is 8.64 percent, and nitrogen is 17.28 percent by mass.

Where's the pictures ?

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.