Two cylinders X and Y each contain a sample of an ideal gas. The samples are in thermal equilibrium with each other. X has a volume of 
and contains 
of gas at a pressure of 
. Y has a volume of 
and contains gas at a pressure of 
. Data for the two cylinders are shown in the figure below.
Show that the temperature of the gas in X is 
.
Determine the number 
of molecules of the gas in Y. Explain your reasoning.
