How many liters of 1.5 m hcl solution would react completely with 6.5 moles ca(oh)2? ca(oh)2(s) + 2 hcl(aq) yields cacl2(aq) + 2 h2o(l) 2.2 l hcl(aq) 4.9 l hcl(aq) 8.7 l hcl(aq) 1.9 l hcl(aq)

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!