What is the osmotic pressure of a 0.065 molar aqueous nacl at 298 kelvin?

According to osmotic pressure formula:
π = iCRT
when π is the osmotic pressure
i is van't Hoff factor= 2
R universal gas constant 0.0821 
T temperature in Kelvin = 298 K
C is molar concentration of solution =0.065 M
So by substitution, we will get the osmotic pressure:
∴π = 2* 0.065 * 0.0821 * 298 = 3.18 atm

D. most models represent a real world object in a simpler way