Which of these is a major drawback of using fuel cells in a car? a lack of hydrogen filling stations
a drop in reliance on petroleum products
an increase in water vapor into the atmosphere
an increase in the use of rechargeable batteries

What does the mass of 0.7891 mol of ferric oxide (fe2o3)

The arrangement of particles is most ordered in a sample of

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!