Paintball is a popular recreational activity that uses a metal tank of compressed carbon
dioxide or nitrogen to launch small capsules of paint. A typical tank has a volume of
508 cubic centimeters. A 340.-gram sample of carbon dioxide is added to the tank before it
is used for paintball. At 20.°C, this tank contains both CO2(g) and CO2(ℓ). After a paintball
game, the tank contains only CO2(g).
70 Determine the total number of moles of CO2 added to the tank before it is used for
paintball. [1]

71.

71 In the box in your answer booklet, use the key to draw a particle diagram to represent
the two phases of CO2 in a newly filled tank. Your response must include at least six
molecules of CO2 in each phase. [1]

72.

72 After the paintball game, the tank has a gas pressure of 6.1 atmospheres and is at
293 K. If the tank is heated to 313 K, the pressure in the tank will change. Show a
numerical setup for calculating the pressure of the gas in the tank at 313 K. [1]