<span>Stating that collisions of gas particles are perfectly elastic means that no kinetic energy is lost when the gases collide, and no kinetic energy is gained. Some of the properties of gases include volume, pressure, thermal conductivity, pressure, and viscosity.</span>
Answer:
Density of Ar gas under the given condition is 1.52 g/L
Explanation:
Density in grams/liter = (mass of Ar gas present in flask)/(volume of flask)
We know, number of moles = (mass)/(molar mass)
Molar mass of Ar = 39.948 g/mol
So, mass of 0.228 mol of Ar = 
Volume of flask = 6.00 L
So, density of gas inside flask = 
Hence, density of Ar gas under the given condition is 1.52 g/L