You have 20.0 grams of Pb(NO3)2. You put it in water and bring the
final volume to 50.0 mL. What is the Molarity?

The solid xy decomposes into gaseous x and y: xy(s) m x(g) + y(g) kp = 4.1 (at 0 °c) if the reaction is carried out in a 22.4 l container, which initial amounts of x and y will result in the formation of solid xy?