Question

Why do real gases not behave exactly like ideal gases?

Answer 1

Real gas particles have significant volume

Real gas particles have more complex interactions than ideal gas particles

Answer 2

The answer is;

1. Real gas particles have significant volume
2. Real gas particles have more complex interactions than ideal gas particles

When using the ideal gas equation (PV= nRT)particular assumptions are made. That the molecules of the gas occupy negligible space and that the molecules only interact through elastic collision. However, the molecules of real gas have a finite volume and they interact also through intermolecular forces (such as in partially-charged molecules).