Rank these real gases according to how closely they resemble an ideal gas. CO, N2, Ne, He, NH
Concepts and reason
A gas whose molecules do not have any kind of interactions and whose molecules possess negligible space in comparison to the whose volume of gas. This is only possible at high temperature and low pressure. Therefore, this is a hypothetical gas which is also known as ideal gas.
A real gas is a non-hypothetical gas whose molecules interact and occupy space. A real gas can behave ideally only when they have negligible attractions.
The non-polar molecules possess Vander Waals forces which behave more like an ideal gas. And the polar molecules possess dipole-dipole interactions.
The van der Waals forces are the weakest forces which are possessed by the monoatomic gases. And this force depends on the surface area. Lager the size of the molecule, more will be the force of attraction.
The dipole-dipole interaction is stronger and increases with the size of the molecules.
The correct order of real gases that can behave ideally is
Among He and Ne, He is smaller in size therefore, it has the weakest force. And then ne and after ne is N2 which is also a non-polar molecule. Among CO and NH3, CO being smaller in size than NH3 has weaker force of attraction.