CHEMISTRY
posted by Kerrie on .
Water has a van der Waals constants of a = 5.464 L·atm/mol2 and b = 0.03049 L/mol. What is the pressure of 5.20 moles of water vapor in a 1.10 L container at 100.0°C?
I Don't understand this problem!

http://en.wikipedia.org/wiki/Van_der_Waals_equation_of_state
Use the modern form of the equation. You are given a,b,n,R, and T.