If amy takes the mass of the bag with all its contents are bubbling stops and compared the final mass to thr starting mass what should she conclude assuming no human error?

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?