Q: Answer the following question given this paragraph: There are several different equations that better approximate gas behavior than does the ideal gas law. The first, and simplest, of these was developed by the Dutch scientist Johannes van der Waals in 1879. The van der Waals equation improves upon the ideal gas law by adding two terms: one to account for the volume of the gas molecules and another for the attractive forces between them. Q: Which equation improves upon the ideal gas law by adding two terms: one to account for the volume of the gas molecules and another for the attractive forces between them? A:

Options: (a). Heidiger's principle. (b). Pascal's equation. (c). Newton's third law. (d). van der waals.
The answer is:
(d).