Physical Chemistry- Entropy

Question

Is entropy for a real gas larger than ideal gas? When I solved a problem in class, my value real gas was lower than the entropy for ideal gas. I am wondering why is that the case. Unless I made a mathematical error.

Answer 1

The entropy of an ideal gas will be greater than that of a real gas (all things being equal). The reason is in its definition: an ideal gas has no attractive forces, while real gas often has small attractive forces (generally speaking). Therefore, more particles are typically in the gas phase (higher entropy) for an ideal gas than a real gas. More entropy is especially true at lower pressure and higher temperature. Note that ideal gases are described as particles where as real gases typically are not.