Calculate the osmotic pressure of 0.2 M aqueous solution of electrolyte at 300 K . If van't Hoff factor is 1.6 [ R =0.0821 ~atm dm ^3 ~K ⁻¹ ~mol ⁻¹ ]

Step-by-step solution

The osmotic pressure of an electrolyte solution is given by the van't Hoff equation = iCRT , where i is the van't Hoff factor, C is the molar concentration, R is the gas constant, and T is the absolute temperature. Substituting the given values i = 1.6 , C = 0.2 M , R = 0.0821 dm ^3 atm K ⁻¹ mol ⁻¹ , and T = 300 K : = 1.6 0.2 0.0821 300 = 7.8816 atm Rounded to two decimal places, the osmotic pressure is 7.88 atm , which corresponds to option B .