Evaluate (dS/dn for a van der Waals gas. For an isothermal expansion, will AS be greater for an ideal gas or for a van der Waals gas? Explain your conclusion.

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A: As per Bartleby guideline I am answering the first question only.Please repost your second question.

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First law of Thermodynamics

The word thermodynamics consists of two words: thermo- and dynamics. Dynamics means the study of motion. The field of thermodynamics is all about the study of the movement of heat. In a more meaningful way, it is stated as the study of the transfer of energy. Energy transfer is something that we encounter in day-to-day life. Automobiles, chemical reactions, refrigerators, and power generators work on the basis of thermodynamic principles.