A solution is prepared by dissolving 2.60 g of a strong electrolyte (formula weight = 101 g/mol)in enough water to make 1.00 L of solution.The osmotic pressure of the solution is 1.25 atm at 25.0 °C.What is the van't Hoff factor (i)for the unknown solute?
A)0
B)0.99
C)1.98
D)2.98
E)0.630

Question

Quizplus · Accepted Answer

The van't Hoff factor (i) is calculated using the formula for osmotic pressure: π = iMRT. First, calculate the molarity (M) of the solution: M = (2.60 g / 101 g/mol) / 1.00 L = 0.0257 mol/L. Using the osmotic pressure formula: 1.25 atm = i * 0.0257 mol/L * 0.0821 L·atm/mol·K * 298 K. Solving for i gives i ≈ 1.98.

A Solution Is Prepared by Dissolving 2