Refer to the example about diatomic gases a and b in the text to do problems 19 - 27.
it was determined that 1 mole of b2 is needed to react with 3 moles of az.
how many grams in one mole of b2? a) 14 b) 28. c) 1

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.

The correct answer is "atomic weight".

Solubility would be your answer.