*1.) The temperature of a sample of a gas increases from -25 degrees Celsius to 50 degrees Celsius. The initial volume of the sample is 15 L. What is the final volume of the sample if pressure stays constant?

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?