Which sample of argon contains a total of 3.01 x 10^23 molecules at STP?
A)40.0g B)22.4L C)20.0g D)11.2L

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?