I А A B Which parts of the fuel cell do A and B represent? o air anode and cathode electrolyte hydrogen and nitrogen

What is important to study for nios grade 12 chemistry? i have only one month left.

Kc = 0.040 for the system below at 450oc. if a reaction is initiated with 0.40 mole of cl2 and 0.40 mole of pcl3 in a 2.0 liter container, what is the equilibrium concentration of cl2 in the same system? pcl5(g) ⇄ pcl3(g) + cl2(g)

Element before carbon on the periodic table