21. How many calories of heat are absorbed when 50 grams of water at 100°C are completely vaporized? (Heat of vaporization = 540 cal/g)
А.590
B.5400
C. 27000
D. 54000
+

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!

A40 kilogram skier starts at the top of a 12 meter high slope. at the bottom, she is travelling 10 meters per second. how much energy does she lose to friction

Which samples do the atoms have the least kinetic energy