It is noted that “i” was treated as being two here. Was it? What factors affect the value of i?

i is van't hoff factor 

Post Lab Questions: 1. Calculate the freezing point of a solution containing 1.64 g of p-dichlorobenzene (CeHCl2; molar mass=154.2 g/mol) dissolved in 12.51 g of camphor. The freezing point of pure camphor is 178.4 C, and its Kf= -37.7C kg/mol 2. When 3.24 g of p-dichlorobenzene was dissolved in 25.40 g of benzene, the solution froze at - 1.9 C.The freezing point of pure benzene is 5.4 c. Calculate the Krof benzene. Now, calculate the theoretical boiling point of the same mixture. 3. A solution containing 1.05 g of an unknown plus 6.12 g of camphor froze at 158.4 C. The freezing point of pure camphor is 178.4 C, and its Kris -37.7 C kg/mol. Calculate the molar mass of the unknown. 4. It is noted that "i" was treated as being two here. Was it? What factors affect the value of i?