a. State what is meant by an ideal gas.
b. A cylinder contains 500 g of helium-4 at a pressure of 5.0 × 10⁵ Pa and at a temperature of 27 °C. You may assume that the molar mass of helium-4 is 4.0 g. Calculate:
i. The number of moles of helium the cylinder holds
ii. The number of molecules of helium the cylinder holds
iii. The volume of the cylinder.

One assumption of the kinetic theory of gases is that molecules undergo.