Mark all the things that can be chnaged about a chemical equation when it is being balanced

What is true for a substance that releases energy

Find the mass, in grams, of 5.00*10^23 molecules of f2

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?