which statement best helps to explain the observation that nh3(l) boils at −28°c, whereas ph3(l) boils at −126°c?

Nonmetal halogen family atmoic mass 35

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)

Calculate the number of molecules present in 0.750 mol of mgo.