Consider the reaction between hydrogen and oxygen gases to form water: 2H2(g) + O2(g) → 2H2O(l) If 8.5 moles of oxygen react with sufficient hydrogen, how many grams of water should form?

What are the following units

The gas would begin to expand, and eventually the can would burst or explode.

Afraidsugar lol it’s the third one

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.