Question

A solution containing $8.3~g~dm^{-3}$ of Urea (molar mass $=60~g~mol^{-1}$) is found to be isotonic with $5%$ solution of non-volatile organic solute A. The approximate molar mass of A is}

• A. $1348.8~g~mol^{-1}$
• B. $361.5~g~mol^{-1}$
• C. $36.1~g~mol^{-1}$
• D. $34.9~g~mol^{-1}$

Hint:

Logic Tip: Isotonic solutions have equal osmotic pressure, so for non-electrolytes their molar concentrations are equal.

Answer 1

The Correct Option is B