Is the enzyme catalyzed reaction of h2o an endothermic or exothermic reaction?

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)

Hey can you me with this i really need y’all

How many grams are in 68.2 molecules of br2?