The osmotic pressure of solutions of PVC in cyclohexanone at \(300 \ \mathrm{K}\) are plotted on the graph. The molar mass of PVC is ______ \( \mathrm{g \ mol^{-1}} \) (Nearest integer) [Given: \( R = 0.083 \ \mathrm{L \ atm \ K^{-1} \ mol^{-1}} \)]
