Calculate the percent mass to volume for a solution containing RbCl at 25 °C if an isotonic solution contains 1.21 % KCl mass to volume.  Assume a van't Hoff factor of 1.7.

• A. 4.98 %
• B. 3.65 %
• C. 2.56 %
• D. 1.95 %

Answer: (D)