How many moles of Cl2 molecules are required to react with 1.36 mol Al atoms? Equation: 2Al+3Cl2⟶2AlCl3

Which statement is usually true about the relationship between activation energy and reaction rates? low activation energy barriers result in low rates. high activation energy barriers result in low rates. low activation energy barriers result in no reaction. high activation energy barriers result in no reaction.

650.j is the same amount of energy as? 2720cal1550cal650.cal2.72cal

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!