A 4 cm diameter vertical cylinder is sealed at the top by a frictionless piston. The piston is 23 cm above the bottom of the cylinder. It is filled with Oxygen (O2). The gas begins at exactly one atmosphere of pressure, and the temperature starts as 5 ºC.
(a) What is the total number of molecules of gas in the cylinder?
(b) What is the total mass of all the gas inside the cylinder?
(c) What is the number density of the gas in the cylinder?