Answer:
The van der Waal's equation is a modified version of the ideal gas law that accounts for the volume of gas molecules and the attractive forces between molecules.
Details:
The ideal gas law is
pV = nRTwherep = gas pressure
V = volume
n = moes
T = temperature
R = the gas constant
The van der Waal equation corrects the volume from V to (V - nb) , and corrects p to (p + (n²a)/V²).
b = volume occupied by gas molecules
a and b are determined experimentally.