∵6% sucrose solution is isotonic with 3% solution of unknown organic substance, thus, π(suctose) =π(otganic substance) or CRT(sucrose) =CRT(organice substance) or [
∴ Molecular mass of unknown organic substance=171 Note - The formula of sucrose in the question is given C22H22O11, which is incorrect. The correct formula is C12H22O11.