In the following reaction, how many moles of H2O are created when 7 moles of oxygen are consumed?
A.3 mol of CO2
B.5 mol of O2
C.72.08 grams of H2O
D.6 moles of H2O
F.1 mol of C3H8

I'm learning about the periodic tables and what each subject's configuration is. for example, hydrogen is 1s^1, but i don't understand how you get that. can someone me understand how to figure out how to figure this out? sorry if the question makes no sense, but it would really a lot if you could me understand! you so much if you can!