Compute all parts of given problem:
Problem: The van der Waals constants for Kr are a = 2.32 L2 atm / mol2 and b = 0.0398 L/mol.
Part A: Use these data to find the volume in cubic centimeters occupied by one Kr atom.
Part B: Then estimate the radius of the Kr atom.
Show how you get the answer, so that I can better understand how to do it.