For 10 points name this equation of state created by a Dutch scientist, an early modification of the ideal gas law.
This equation predicts a critical compressibility factor of 0.375 for all substances, which is higher than the actual measured values.  Maxwell's equal area rule fixes a defect in this equation where an isotherm describes a physically impossible state with (*) dP/dV greater than 0. This equation's inflection point on a P-V diagram corresponds to the critical point. Its attractive term is made temperature-dependent in the Redlich-Kwong equation. This equation assumes that molecules attract and repulse one another and that molecules take up space, which are quantified by the variables a and b and are measured for each gas. For 10 points name this equation of state created by a Dutch scientist, an early modification of the ideal gas law.
This equation predicts a critical compressibility factor of 0.375 for all substances, which is higher than the actual measured values.  
van der Waals equation of state