Someone please help me

I need help on task card #7 - #18

List four observations that indicate that a chemical reaction may be taking place

What reaction is taking place? 02 + c3h8 = h20 + co2

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?