Calculate ΔH° for the following: Co3O4 (s) → 3 Co (s) + 2 O2 (g)
using the following:
Co (s) + 1/2 O2 (g) → CoO (s) ΔH° = -237.9 kJ
3 CoO (s) + 1/2 O2 (g) → Co3O4 (s) ΔH° = -177.5 kJ

Jewelweed, a flowering plant, has seed pods that burst open when touched and forcefully eject their seeds. these structures are favorable because they a. can cause genetic changes to occur. b. prevent germination within the seed pod. c. aid in the dispersal of the species. d. attract insects that aid in pollination.

Which compounds have the empirical formula ch2o? a.c2h4o2 b.c3h6o3 c.ch2o2 d.c5h10o5 e.c6h12o6

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!